Upgrades and Repairs TestimonialsSee all

Robert from AZ

“ Got my high flow valve and angled tank adapter today and just finished installing it.... „ more Fast shipping, and that angled adapter is nice. Much easier to aim and hold steady. Gave it the 3500 pound test out back with a 2x4. 43 grain went clean threw and into the tree with a 10/13 setting. Also got the parts to fix my factory valve with the high flow valve. 95 hammer and back to the factory spring. Valve didn't like that heavy spring, broke the bushing in half and the bushing spring looked drunk. Learned some things messing with these valves. „
Philip porter

“ I am the customer it was made for, it was made for my jkhan 9mm... „ more Majesty, it works perfect and the quality is great, super fast shipping. Funny I'm finally leaving this review 1and a half years after buying it. Great work „
Andrei

“ Hi ! I just received the regulator and the repair kit (hammer , spring guide... „ more and spring) and it works great. The only problem that i had was with the spring guide because it was to long and the mechanism could not be armed , after i cut off about 13 mm everything works great ! „
Michael

“ Alles Super, bis auf den Zoll in Leipzig. Da wirst du wie ein Verbrecher behandelt,... „ more Nach gefüllten 20 E-Mail. 57,18€ Zoll Nachzahlung ???? „
Horst

“ Die Ware ist sehr sehr gut / bestens verarbeitet / ausgezeichnete Qualität / Top Leistung... „ more / sehr schnelle Lieferung / muss man weiter Empfehlen starkes Team vielen Dank „
Clive Bates

“ I've just fitted one of these values to my 6 year old gun power stealth... „ more and it's completely transformed my rifle. Brilliant service and a beautifully engineered valve .. „
Horst

“ Sehr saubere Arbeit / beste Qualität / sehr gute Leistung / schnelle Lieferung /... „ more muß man weiter Empfehlen alles korrekt :-) Vielen Dank „
Dom

“ This is absolutely fantastic. So many more shots per fill and extremely consisitent. Like all... „ more the stuff here, it is very well made and does what it says. It could be improved by adding a filling valve dust cover to it but I guess this would put the cost up. They could add a cheap rubber one but then I guess many people would swap it for their custom one. I would anyway as they are so much better and will last a lifetime, unlike the cheap rubber ones. Anyway, this product completely transforms airforce airguns. „
Nitro

“ Fitted perfect to my LG400. I fill up maximum, depend what pressure my scuba bottle... „ more gives. This were a big pleasure for me. Good design on the quickfill. „
Leonard

“ Ola, recebi o regulador muito rapido, possui excelente acabamento, funciona perfeitamente, recomendo plenamente a equipe... „ more da pcptunes, sao muito atenciosos e os produtos sao de ótima qualidade „
Mansour

Shipped quickly very happy with the international shipping without problems. Thank you.
peter

Hallo, suche für Hatsan Bullmaster (Turkbell)
James Medd

“ I'd tried to buy this valve in the UK but couldn't find the right item... „ more for the job. I bought one of these valves from PCP Tunes and couldn't be happier with the workmanship, craft and overall quality of the item. I've received 5 star customer service from this supplier, and I'd be more than happy to recommend them. Will certainly be using their services again! „
aktham

“ the gauge is red between 200-300 bar it is not like the original one which... „ more is red after 300 bar „
Monty

“ Just received my 1250 cyclinder with fill probe today. Arrived in good condition here in... „ more the states. I like the idea of using the fill probe instead of removing the cylinder to charge. The cylinder I received is made out of aluminum by the pressure gauge is red from 200 bar to 300 bar. I am a bit leary of charging this thing to 300 bar as stated in the description. „
Phil Meldrum

“ Gunpower Valve Guide - once again amazing service from PCP TUNES. YOU SHOW THE REST HOW... „ more IT SHOULD BE DONE! Ordering more parts today. Many thanks. „
Phil Meldrum

“ Gunpower valve - shipped to UK & delivered faster than most UK suppliers could do. Great... „ more service,great product. Big thumbs up to the boys at PCP Tunes „
Phil Meldrum

Fantastic product again. Delivery time brilliant. Top class service again guys. Many thanks.
Al L.

“ Moderator not only looks great, but considerably reduces the sound of the gen 2 ATI... „ more Vulcan. Not quite whisper quiet, but definitely backyard friendly. Mates perfectly with the Vulcan shroud extension adapter. „
Al L.

Fits the Gen 2 Vulcan perfectly. Shipped quickly, very securely packaged.
passalis christos.Greece

exellent work,great performance for my gunpower sss
Christos Passalis.Greece

great quality,impressive performance. And the best and fastest service, thanks pcp tunes!
P Griffin

“ Nicely made but DOESN'T FIT the latest FX Bobcat MK2. You will need a... „ more MaleToMale Adapter to attach to the shroud. It would be really helpful if this was documented more explicitly on this site. (But don't be too hard on yourselves as when I ordered a full FX Moderator kit, FX didn't supply a MaleToMale adapter either, so now i have 2x alloy paperweights). „
David G.

“ Long time without knowing that I could use a moderator in my Vulcan gen.1, and... „ more suddenly I discovered the adapter in this web. Installed and adjusted perfect, very happy with the international shipping (only 4 days) without problems. Thank you. „
David G.

“ Unbelievable service from this store. Very fast shipping (received the same week) and without annoying... „ more customs problems knowing the inconveniences of sending this "type" of product. Regarding the product, simply the best, good quality manufacturing and perfect fit. Honestly, very happy. „
Tudor

“ Excellent product. Looks and feel good. Greatly improves the rifle operation. Very... „ more fast delivery. Thanks! „
paul sutton

“ ordered adapter come really quick problem with it pcp tunes sorted problem and sent new... „ more adapter first class many thanks „
Philip

“ I bought this in march and it is perfect and looks great, shipping was 3... „ more days „
David Jones

“ A must for any gunpower/airforce owner.engineered to a very high standard.if i could give this... „ more product more than 5 * i would super fast delivery. „
Matthew

Excellent valve works great fast delivery.I would highly recommend PCP Tunes.
Michael

“ Brought this a while ago for my dominator worked great until i took it apart... „ more :( spoke to the guys here at pcp tunes and they sent me the parts i had broke within three days great service. Wouldn’t hesitate to order from you again thanks. „
Paul

“ Got this shipped to the USA in 4 days! Excellent product works as advertised. Well... „ more packaged, built, and allowed me to attach my moderator directly to my Cricket! No POI shift either. „
Jeremiah boyle

“ I ordered the 500 cc buddy bottle rated at 3600psi and order was processed immediately,... „ more to my surprise I had bought a tank from India, and it had me a little worried. But three days later the bottle showed up I Was waiting with in empty condor valve and bottle only to see 3000 psi stamp on the bottle. After emailing with pcptunes they asked for a pic assuring me it was a mistake and that if I. Send it back they would refund shipping and resend the correct bottle. So still worried I sent the tank back at my expense hopping. All work out pcp tunes is a did great company great with great response and fantastic Customer Service Jeremiah boyle Illinois usa „
X4vi3r

“ Super fast delivery and an excellent moderator. Super quiet and it has an excellent finish.... „ more Excellent quality, I would definitely buy again! „
sergio

Used and doesn't change the accuracy
matthew

Excellent cylinder easy to fill very quick delivery Thanks
Matthew

“ Excellent cylinder very easy to fill,Ordered Friday and it was delivered Monday to the uk... „ more from india very quick. Highly Recommended 100% use again. THANKS „
From Walcott

“ I ordered this item for my .177 Sumatra too,it arriverd without delay and worked perfectly,thanks... „ more to PCP Tunes my Sumatra is now backyard friendly without compromising its awesome power... „
Petteri

“ Wow, that wast fast shipment, thanks ;-) Fits perfect, nice quality and looks good! Great service... „ more and happy customer! „
Scott B. from Arizona US

“ I'll be perfectly honest here I've ordered this product without realizing it was coming from... „ more India and being in the US I was quite concerned that I was going to be scammed but I was pleasantly surprised that Not only was I not scammed but received exactly what I ordered and in only three days. Absolutely excellent machine quality absolutely excellent fit I was able to attach my huggett silencer without any modifications it threaded absolutely perfectly quieting the Diana p1000 by at least 60%. I would gladly do business with PCP Tunes again and recommend that anyone who is cautious do the same. From Mumbai India 2 Arizona in three days I'm amazed at shipping follow through and product quality well done!!! 5 stars!!! „
Pete wainwright

“ Over the past few weeks I have purchased the high flow valve plus other parts,the... „ more quality of the upgrades are superb making them great value for money,the after service and advice given is great and comprehensive,I thoroughly recommend pcp tunes for all your upgrade needs,many thanks „
Jacky Prahec

“ I required custom size of this cap 28 x 1 for Cometa Lynx V10 MK2's... „ more shroud.The product came 3 days after it was sent (sales team continuously notified me about the progress of producing the item). Firstly when I received the product it was very light and very good packed. When I opened it up it was very nicely stored in various soft materials and even plastic bag. The product was awesome quality, anodized, very nice made and fitted my shroud perfectly. I would happily recommend this product to every one. I would also recommend this store/business for any sort of production of metal elements. Exceptional service! „
sactargetshooter

“ Fantastic adapter! The machining is very precise, it is a perfect fit. As a trial,... „ more I install the longest moderator and the alignment is dead on. No clipping and very little change of POI. The adapter is also easy to install and take off without tools. All in all, a very good product. „
Larry

“ One of the best custom parts available for Airforce guns! This replacement breech is machined... „ more to perfection! It seals up to the barrel and top hat great. Improves accuracy while eliminating air loss and tank dumps. „
mark.w

“ amazing prouduct haven't had over a chronograph but with the gunpower stealth in 22 with... „ more 12" barrel shooting at a steel drain pipe with standered valve just dents it with the hiflow it goes through both sides with 14.3grain crosman pellets cant be more happy and the delivery was super speedy to the uk i will be getting more items from pcptunes „
Vinayaka M

“ I purchased a brand new dominator and was disappointed to find a slow leak and... „ more was unable to fix the issue in the factory regulator, which in my opinion is not of good quality. Purchased the upgraded kit from PCP Tunes. Changing the regulator was a breeze thanks too the video link provided and one on one interactions. Leak issue is resolved and my dominator is firing better than the original. The upgraded kit is longer and very well built. Highly recommend the PCP Tunes upgrade kit as the dominator and p1000 design is prone to fail. I am more than satisfied. Thank you Pramod for the seamless fix end to end. „
Larry W.

“ I ordered both of the knobs this is the best one, it is machined aluminum... „ more very nice „
Larry W.

“ Just a few stats to start with I have a 177 valve in a 25... „ more caliber gun which gave me 30 shots...10shots more than the 25 caliber valve, but this gave me a lower speed the Condor is too hot to start with.. now with this regulator a standard Top Hat set at 1.490 inches with a .062 rubber washer I shot the 34 grain JSb at 880 feet a second with a deviation of 3.34 over 42 shots at a standard tank filled with 3100 psi. The regulator has has made this gun a joy to shoot no more point of impact changes over the string. They have done their homework on the size of the area between the valve and the regulator I left mine set at 150 bar. Great quality product the only con is it is slower to fill which is probably a good thing. I would recommend this product very highly. .... „
John

“ I could not be happier with this product. After reading the reviews of the competitors... „ more probe and its poor construction I was weary to find one that would be a good replacement for my Career 707. Ell when I first unpacked this probe I was completely blown away. Any worry I might have had was gone instantly. The construction is very high quality and that was apparent from the first handling and the fit into the probe opening is spot on! I have used this fill probe for over about a six week period and it has performed flawlessly. I highly recommend it to anyone looking to upgrade an aging probe or who might be looking for a fill probe to replace a missing or lost one. Excellent service both before and after the sale made for a complete experience that was a perfect 10. I WILL do more business from here again. Thank you for such a great product. „
Devrim Berk

“ Hello I bought for my airforce escape .25 cal air riffle the extreme-flow valve + Extension... „ more Adapter for Extreme-Flow Valve + 500 cc tank i can say those products are damn good. The customer service help and returns for your questions are perfect. I can easily suggest for anyone who have a question about pcp tunes.... I tested my riffle at around 250+ meters can easily say the pover is amazing. When i will find a safe place for longer ranges will share it too well done pcp tunes... „
Mohammed Amjad

“ Bought this Reg. for my Evanix RS II (.177). Excellent product, with a small mod... „ more on HS,now I am getting 104 shots (8 Mags) for an ES of 19 fps @ avg 899 fps with 10.6 grn pellets from 200 Bar fill. I have done some other mods also from PCP tunes. Quality work and excellent customer service. Thanks, „
Achu

“ My discovery .177 was low on power and so I had it sent to Mr... „ more Pramod to have it powered for the jsb monster 13,43gr. He had it adjusted right to my specification and now i am very happy with what he did. Thank you, Mr Pramod „
Asalie

“ My Regal was having issue with the magazine loading as the bolt was not cocking... „ more fully. I had sent it over to Mr Pramod who promptly resolved the issue and had it sent back to me in no time. Now the magazine is loading without any issue. A gem of a person to deal with too. Thank you so much Mr Pramod. „
Kezha

“ I had damaged my Cyclone by disassembling it myself and had misplaced most of the... „ more parts as time went by. I came to know Mr Pramod through a mutual friend who suggested me to send it to him. I then dispatched what was left of my Cyclone to Mr Pramod. Later I came to know through him that many many parts were missing and some parts rusted . Mr Pramod with his 'never say die' attitude gathered all of the parts and had rebuilt my Cyclone from scratch. He also had my Cyclone chronographed for the jsb 15.89gr pellet. After getting my hands back on the Cyclone, I had it tested out and now I am getting less than an inch grouping at 36 yards. No amount of words can justify how much I am indebted to Mr Pramod for reviving my Cyclone. Salute to you, Chief. „
Abhijit

“ The regulator with dual guage is really an awesome product which has completely changed the... „ more condor performance. The regulator has greatly refined the accuracy and consistency of shots. The regulator pressure can be adjusted according to ones needs. The dual gauges display the regulator and the tank pressure. Value for money. „
Joe Eigo

“ I am impressed by how this kit changed my condor into a bigbore powered pcp!... „ more I recently bought the texan and it's a beast to shoot. Now I look forward to using my condor again. It only took a few days to arrive after ordering and I often wonder what a bigger sized bottle would be like with this extreme valve :) „
Vinod bedassie

“ I am totally impressed by the quality of the products pcptunes produce ....their customer service... „ more and products is second to none they made a fill probe for a dragon slayer ...it was perfect.....I highly recommend this company „
A...r from Eastern Europe

“ It starts doing a boring, again the same thing: fast delivery, high quality, the best... „ more performance. Keep up the good and see You soon...:) „
Kezha

“ I had sent my Royale for repair to Mr Pramod as there was an air... „ more leakage and the bolt was also not cocking from time to time. He had repaired the leakage and also machined a part for the trigger assembly. It was then chronographed, tested and dispatched back to me in no time. A blessing to all PCP lovers. Continue the good work, Chief. „
Kezha

“ My Regal was not holding any air and Mr Pramod was recommended by a friend... „ more for the repair. It was repaired within a short span and on my request, the power was also tuned down for more shot count. A humble person to deal with and very knowledgeable in his field of work. My best wishes to Mr Pramod for his future. „
Cristian Rando

“ Excellent product! The craftmanship is of the best quality you can find. Works smoothly and... „ more yields great velocity regularity, especially when combined with the rest of the tuning kit components. „
Cristian Rando

“ Amazing kit that, when combined with the rest of the components advised by the PCP... „ more Tunes team, gives your Condor power enough to turn it into another kind of air gun. If it is power and accuracy you are looking for, this is surely a shortcut to get it. The craftmanship is of outstanding top quality. I strongly recommend it. The customer support and advise is far above standard. „
Cristian Rando

“ Excellent tank. Very high quality. Adds a lot of power and shot count. A must... „ more for slug shooting at a regular output. „
Farhan

“ I had sent him two of my air rifles and feed back is long over... „ more due. All I want to say is the guy is unmatched in india. Amazing knowledge of the working of pcps. The best part is the kind of detail e mail he sends you explaining what was wrong and what needs to be done. I mean he puts his heart into it!! To sum it up. I don't worry about something or anything going wrong with my stuff. I know he is a call away and will fix everything. I mean everything „
Elsiony (Silvano)

“ Great product. Exquisite workmanship. Visual very beautiful. Impressive performance. I recommend for people who want... „ more something that really worth the price. The service is a splendid, they answer all the questions before the negotiations and after the sale. Thank PCPTunes. „
Elsiony (Silvano)

“ Great product. Exquisite workmanship. Visual very beautiful. Impressive performance. I recommend for people who want... „ more something that really worth the price. The service is a splendid, they answer all the questions before the negotiations and after the sale. Thank PCPTunes. „
Tomasz from Europe

“ This item fits to PCPTunes one piece valve stem and my original Gunpower stem with... „ more top hat. Very exact dimensions of the hole. No leaks, no problems. I recommend….. „
Tomasz

“ Perfectly machined. I bought as a spare part to my PCP Tunes valve. Fits to... „ more my original Gunpower SSS valve and PCP Tunes valve. Fast shipping to Europe. „
Tomasz

“ Perfectly machined. I bought as a spare part to my PCP Tunes valve. Fits to... „ more my original Gunpower SSS valve and PCP Tunes valve. Fast shipping to Europe. „
Steve

“ I bought this valve, I had converted my condor to .257 and have been... „ more shooting 74 grain slugs at what I thought was powerful, until I installed this valve, my 74 grain bullets became not accurate and just blazed to the target, they were moving way to fast. I upsized to a 89 grain bullet and this thing drives them faster than my old valve did the 74 grain, accuracy is great I get 8 good shots, cant give you velocities since my chronograph hasn't arrived yet. But I do know it will push these 89 grain bullets through 2x4's at 100 yards for 8 shots straight. „
madhan ashok

“ Really awesome service done by Mr.pramod by upgrading my condor and I'm also agree with... „ more Mr.daya „
karun

“ My airranger has not been loading and had lost groupings, so i sent it to... „ more him for repairs. He has done excellent job, sorted out the problem and explained the minute details taught me the trigger setting...Now my toy is shooting better than when it was new..Thanks a ton „
karun

“ I had given my fx 400 for repair because of sudden loss in power. He... „ more solved the problem and performed an upgrade, now it is shooting very good. „
Aochuba

“ Recently had my Brocock Contour repaired by Pcpctunes. it is shooting better now than... „ more it originally used to do. A very knowledgeable and very helpful person.Great to have someone in the country who can repair pcps. „
Tomasz

“ Quality product. Much better than original stem. Shipping was very fast to Europe. Great communications... „ more as always. „
Joel Jimmerson

“ In this review I will speak only to the build, finish, and quality of the... „ more parts and to my experience with PCPTunes. I received this valve as a part of the package with the 1 liter 4500# bottle. The quality of the valve was superb but it did not fit exactly for my specific requirement. This was not the error of PCPTunes but rather my own error. My first thought was that I was stuck with a product that I couldn't use. One email and a very quick response later my problem was solved. I cannot express just how much of a relief it was to have the level of support that I received from the Sales Team. The response, the solution, and the replacement was fast. When doing any business over the internet, the great unknown is trust. As far as these guys go, you will get a superior product at a competitive price and they stand behind what they offer. I will post a follow-up review once I've had time to quantify results. „
Tomasz from Europe

“ Very good valve, better than original. I use it on my Gunpower SSS cal .25... „ more with factory spring and hammer. Powerfull shot,no problem to shoot on 200 meters. A few words about them: Very good contact, they answer each question and even monitor my package. Highly recommended seller. Thank you. „
Dhruv Daya

“ I gave my Condor to Pramod of PCP Tunes for upgrading , i happen to... „ more have the first feeling of this upgraded rifle last Sunday, Boy O boy she fires ultra smooth now & accurate which i never found it to be true, i could fire Hole in hole is the accuracy she firing now. Congrats Pramod & looking forward to much more interaction with you „
A...r from Eastern Europe

Good quality, now I have no problem with removal brass Valve Guide, and valve.
A...r from Eastern Europe

“ I use it with my custom spring and Extra Heavy Brass Hammer (124 g), and... „ more there is no problem to drive 43,2 grains at a speed of 1155fps (first shot, 250bar, and the power wheel 13/10). Good workmanship, much better than the stock valve. „
A...r from Eastern Europe

“ It was my first order from PCP TUNES when the store had an old page,... „ more over 3000 shots and the delrin guide is like new. „
A...r from Eastern Europe

“ Huge power, everything below 40 grains drive supersonic, starting from 250 bar I have following... „ more results in the first shot: 51 grains-1065fps, 43,2 grains-1140fps, 31 grains-1295fps and the best of the best...24 grains-1384fps. PCP Tunes is the best shop, there is no problem with anything, everything is good quality, shopping 3 times and will certainly be back soon. THANKS FOR EVERYTHING PCP TUNES!!! „
Rodnei Christino

This valve guide removal tool is great. I recommend.
Rodnei Christino

“ The extreme valve is excellent. The tests I realized gave the following results: Cast bullets 6.35 -... „ more 52 grains Higher speed - 1050 fps Lower speed - 990 fps Number of shots within this range - 15 „
Siddharth

“ This is a great product, getting very consistent results, awesome power enhancer, feels like my... „ more condor is on steroids. Thanks again Pramod „
Siddharth

“ The 500cc tank comes in very handy when shooting heavy pellets/slugs, saves time & energy... „ more refilling the tank, specially with a hand pump. Shoots more rounds with higher velocities, great product. Thanks Pramod for suggesting this product. „
Rodnei Machado Christino

I have one of these and it gives the gun a very beautiful appearance.
Rodnei Machado Christino

Piece with excellent workmanship. And it looks much pretty on the gun. I recommend.
Rodnei Christino

“ The cylinder is excellent. The cylinder is excellent. It has good quality and works perfectly. Shipping... „ more was very fast. I recommend. „
Rodnei Christino

“ This tank is so good that I bought another one. This tank is so good that... „ more I bought another one. It increased the power and autonomy of my condor. Great. I recommend. „
George Tsiotas. Greece

Excellent job. PCPtunes improves and supports my air gun when AirForce (GunPower) just doesn't.
danyac

“ this is presicion made and real works great. this is presicion made and real works great.shipping... „ more was very fast.9 on a scale of 10 perfect.they are really concerned if your happy and will help in a e-mail.give them a try you will not be disapointed. „
Rodnei Christino

It works better than the original one. It works better than the original one.
Jaideep

“ Got a steel 90 grams hammer and it works wonders. Got a steel 90 grams hammer... „ more and it works wonders . Very well made .It increases the power when used alongwith the valve mod done by pcptunes . I got almost 200 FPS more with the steel heavy hammer and moded valve of pcptunes compared to my stock condor .Mine is a 25 cal air gun . would recommend this mod combo to all power hungry Air gunners . „
danyac

“ i got the valve and hammer i got the valve and hammer.what a difference it made... „ more in my .22 talon.2800psi fill 60 shots high 842 low 826 spread 16fps devation 3.5 18.1 jsb refilled 2200psi the wheel was set at o.the shipping was excellent no worries there.workmanship super.i will defenetly use this company again. „
George Tsiotas. Greece

Excellent job. Excellent job. PCPtunes improves and supports my riffle when AirForce (GunPower) just doesn't.

1 Ltr Luxfer Carbon Composite Cylinders 300BAR (61cu)(1000cc) (Bare) With Butt Plate Assembly

Product Code: PCPT1LLCCC3B61BWBPA-C1
Availability: In Stock

Price: $400.00
Ex Tax: $400.00

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1 Ltr Luxfer Carbon Composite Cylinders 300BAR (61cu)(1000cc) (Bare) With Butt Plate Assembly

1 Ltr Luxfer Carbon Composite Cylinders 300BAR (61cu)(1000cc) (Bare) With Butt Plate Assembly

Operating Instructions:

Bare Cylinders with our 3 stage sturdy adjustable buttplate.

The Solid Adjustable butt Plate is made from High grade metal for durability, coated black for looks and will give you
3 adjustments levels to suit your requirements.

These cylinders are very light when compared with Aluminum and weigh one-third to a corresponding steel tanks.

Carbon fiber tanks can be filled to 4500 psi as these are 300 BAR rated tanks.

Do not fill more than the working pressure of your valves. (Check manual for standard fgactory valves working pressure)

If you are purchasing our valves then the working pressure would be mentioned for them. Always double check before filling to the rated pressures of the valves.

This higher pressure capability tank will help you achieve the higher shot count at high power.al long distances.

Imp Note:- Dont forget to shop for these "Airforce Larger Tank Angled Adapter" as they are a must to attach the valves to get started with the tank and buttplate configuration.

Without these, the valves would not clear the frame. If you have your custom extension or angled adapter then only go in for these, else the below product would suit you needs and save you some money as well.

"Airforce Texan Larger Tank and Angled Adapter"

If you don't like the drop and are looking for a straight adapter then you might want to look for the below.
Extension Adapter for Extreme-Flow Valve Ver 2
But do remember you will need either the angled or straight adapter for the larger tank setup to work.

Specifications:

Brand : Luxfer
Cylinder Batch : 2017
Cylinder Design Life: 15 Years
European Certification: EN 12245
Approving Authority: EN 12245,CE/PED Standard
Neck Thread: M18 x 1.5
Diameter: 85mm (3.34 inches)
Length : 295mm (11.61 inches)
Empty Tank Weight: 1.78 lb (without butt plate and valve)
Cylinder Decommission Year: 2032
Decommission date refers to the last date that the cylinder can be filled at a registered fill station. You can safely continue to use the cylinder after this date until the air is depleted, it just cannot be re-filled at a commercial fill station.

Additional Notes:

These bare tanks weigh just 790 grams which are just 40 grams more than the 500cc bare buddy bottles.
So you get twice the volume of air without much increase in weight of the tank.
5 year cylinder hydrostatic test cycle.

What Ships with the Tank:

Bare Tank and No Valve Assembly
1 Ltr Luxfer Tank
Heavy Duty Adjustable Butt Plate.

Contact us if you need any further customization and we shall be happy to get it done for you. Click Here --->> Contact Us