Posted: 5/20/2026 5:08:31 PM EDT
[Last Edit: bfoosh06][Edited]
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So I just watched a few Videos about Proof's New barrel tech... PXT. ( PROOF Exponential Twist ) @SuperJlarge Now I want one. ( Also available for bolt guns ) Watch the video, it shows the advantages... yes it is long but.... Quoting... DESIGNED FOR THE ENTHUSIAST PROOF Research PXT AR barrels represent a new evolution in barrel technology, combining advanced rifling geometry with the performance and precision shooters have come to expect from PROOF. PXT - PROOF Exponential Twist - is a complete rethinking of conventional rifling design and twist progression, engineered to reduce engraving force, minimize throat erosion, and create a smoother transition as the projectile engages the rifling. By dramatically reducing rifling lead angle and smoothing projectile engagement into the bore, PXT technology helps reduce wear, improve consistency, and create less felt torque during firing for improved recoil control and the ability to stay on target more effectively. In controlled testing, PXT barrels have demonstrated significant increases in barrel life while maintaining the accuracy standards expected from a PROOF barrel. Our PXT AR barrels arrive fully chambered and ready for installation, making them an easy upgrade for shooters looking to build or refine a high-performance rifle system. Available in both PROOF carbon fiber and traditional steel configurations, PXT AR barrels deliver lightweight handling, precision performance, and next-generation barrel technology across a wide range of modern gas gun applications.  Introducing… PXT - Proof Exponential Twist. Just thought I'd share... I mean who wouldn't like longer barrel life ? |
*Hold on to your AR-15s. Their magic must be very powerful, or they wouldn’t want them.*
JAFOM.... Just another fat old man.
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JAFOM.... Just another fat old man.
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TOGC,IADC
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Originally Posted By bfoosh06: So I just watched a few Videos about Proof's New barrel tech... PXT. ( PROOF Exponential Twist ) @SuperJlarge Now I want one. ( Also available for bolt guns ) Watch the video, it shows the advantages... yes it is long but.... Quoting... DESIGNED FOR THE ENTHUSIAST PROOF Research PXT AR barrels represent a new evolution in barrel technology, combining advanced rifling geometry with the performance and precision shooters have come to expect from PROOF. PXT - PROOF Exponential Twist - is a complete rethinking of conventional rifling design and twist progression, engineered to reduce engraving force, minimize throat erosion, and create a smoother transition as the projectile engages the rifling. By dramatically reducing rifling lead angle and smoothing projectile engagement into the bore, PXT technology helps reduce wear, improve consistency, and create less felt torque during firing for improved recoil control and the ability to stay on target more effectively. In controlled testing, PXT barrels have demonstrated significant increases in barrel life while maintaining the accuracy standards expected from a PROOF barrel. Our PXT AR barrels arrive fully chambered and ready for installation, making them an easy upgrade for shooters looking to build or refine a high-performance rifle system. Available in both PROOF carbon fiber and traditional steel configurations, PXT AR barrels deliver lightweight handling, precision performance, and next-generation barrel technology across a wide range of modern gas gun applications.  https://www.youtube.com/watch?v=lF47B1otpvMJust thought I'd share... I mean who wouldn't like longer barrel life ? It better last a while for $1400... |
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Originally Posted By vmpglenn: It better last a while for $1400... That price is for the Carbon Fiber version. The SS version is $900 bucks.... currently only in 6MM ARC... https://proofresearch.com/barrels/pxt-ar-barrels/ So I hope.. .223 Wylde and 6.5CM is coming soon. Any way... I would be VERY interested the extended barrel life....and the far longer barrel life and the resulting accuracy claims. |
*Hold on to your AR-15s. Their magic must be very powerful, or they wouldn’t want them.*
JAFOM.... Just another fat old man.
________________________________
TOGC,IADC
JAFOM.... Just another fat old man.
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TOGC,IADC
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Odd that I didn’t receive a notification for the tag, but I appreciate it nonetheless. I really hope they offer the blanks for SS barrels. I’m not a hunter, so I tend to not invest heavily in CF. I’ve seen minor POI shifts for longer strings with the CF barrels, but these certainly look interesting. May have to get a .224 blank and see what I can turn out. |
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So far... Proof also offers this "rifling" in SS.... but only in 6MM ARC as per the webpage. "AR" wise... .223 Wylde, 6MM ARC, and 6.5CM in CF. I hope this works out well for Proof... I would be VERY interested in a much longer barrel life in a 6.5CM.... and I agree , I would prefer a SS barrel. Interesting side note... and a timely request ?! Lol https://soldiersystems.net/2026/05/20/ussocom-seeks-hypervelocity-improved-capability-assault-rifle-hicar/ |
*Hold on to your AR-15s. Their magic must be very powerful, or they wouldn’t want them.*
JAFOM.... Just another fat old man.
________________________________
TOGC,IADC
JAFOM.... Just another fat old man.
________________________________
TOGC,IADC
I'm going to watch this 7 minute video first and then decide if I need the 30 minute video . Is this gain twist? I think I saw another maker talking up gain twist recently.  The NEXT Generation of RIFLING | PXT Technology Story ETA It was Seekins using these barrels in their new SIC Rifle.  Exclusive Interview on Seekins Precision's New Barrel Technology |
BikerNut:
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People who don't like motorcycles are just... weird.
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ONE good thing about being old is getting to watch ideas getting recycled. I cant remember if it was the 70's or 80's but this was tried way back when and I thought it was a great idea. They varied the twist rate on a button as it was pulled though the blank. I remember they were trying it out on severely over bore "fast" rounds. It faded into history. Wish we had the internet 50yrs ago, not for porn or gas lighting, for legit reasons. Now days if good ideas come up enough people are out there eventually you will have good execution of those ideas. |
 Ep. 236 - The FUTURE of Rifle Barrels | Exponential Twist Rifling with PROOF |
*Hold on to your AR-15s. Their magic must be very powerful, or they wouldn’t want them.*
JAFOM.... Just another fat old man.
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JAFOM.... Just another fat old man.
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Saw the videos, read about the science and am intrigued. I understand the longer initial twist and the claim of less torque. I see where they groove the barrel circumference and instruct not to cut shorter so as to exploit the fastest twist towards the end. I understand the narrower lands. The military (specifically in naval guns, tank guns, artillery, and auto-cannon) has used gained twist for a long time. Where these influencers lose me is in the effects of the laws of thermodynamics. Many of the military applications I mentioned use multiple lands and bores may be chromed or have separate Stellite liners (nitride hardening not as heat resistant as chrome). Each time a cartridge fires the barrel steel at the throat expands and contracts -- the faster the cycles the less time for the alloy to cool to resting state and condition. The heat also burns out impurities in the alloy (typically carbon). Barrels wear from the throat. Competitive rifles will often show minimal (one thousandth of an inch) throat advancement per thousand rounds (more if firing full automatic and mag dumps). The remainder of the rifling may have light cracking but not as at the throat -- why benchresters can get a few more thousand rounds from a barrel by cutting an inch off the rear of the barrel and re-chambering. Now add the complication of going to 80,000 psi and (I assume) higher gas temperature at the throat. |
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Interesting. Everything old is new again. Gain twist, well over 100 years old, early in the 1800s. Micro-Groove rifling, Marlin introduced in 1953, not sure if anyone did that before Marlin. I hope what they claim lives up to popular use since both MG and GT were interesting ideas then as they are now. I can't wait to see what happens this time around. |
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When he spoke about ELR and getting 2,000+ rounds on a barrel my ears perked up. But max length for a 30 cal blanket is 28”. Not ideal. The discussion about a 6 Arc at 3,100 fps with a 108 really got me. Even if an AR only nets 2,900 with a 108 I am down for one. But, I will wait for multiple reliable sources to verify that claim. |
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Originally Posted By SpeyRod: When he spoke about ELR and getting 2,000+ rounds on a barrel my ears perked up. But max length for a 30 cal blanket is 28”. Not ideal. The discussion about a 6 Arc at 3,100 fps with a 108 really got me. Even if an AR only nets 2,900 with a 108 I am down for one. But, I will wait for multiple reliable sources to verify that claim. How long you want to go? As they keep playing with higher pressures they want to shorten barrels not lengthen them. |
BikerNut:
Normal people like motorcycles. Real people like motorcycles.
People who don't like motorcycles are just... weird.
Normal people like motorcycles. Real people like motorcycles.
People who don't like motorcycles are just... weird.
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Originally Posted By SpeyRod: When he spoke about ELR and getting 2,000+ rounds on a barrel my ears perked up. But max length for a 30 cal blanket is 28". Not ideal. The discussion about a 6 Arc at 3,100 fps with a 108 really got me. Even if an AR only nets 2,900 with a 108 I am down for one. But, I will wait for multiple reliable sources to verify that claim. |
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Originally Posted By SpeyRod: When he spoke about ELR and getting 2,000+ rounds on a barrel my ears perked up. But max length for a 30 cal blanket is 28”. Not ideal. Yes, I want a 10 twist in .30 cal, but a 30" finished length and I'm not interested in carbon wrapped barrels. I want the weight. |
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Originally Posted By ALASKANFIRE: How long you want to go? As they keep playing with higher pressures they want to shorten barrels not lengthen them. It’s not how long it is how fast. For light gun I really like a Berger 245 LRHT at 3,000. My 30” Krieger is at 2,994. I have never heard from anyone they were getting anywhere close to that, safely, out of a 28” barrel. That is with a Norma chamber anyway. |
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I watched the same video from Ray/Xring I wish Proof all the best and I hope to God they do follow up and do the smart thing and offer blanks. I have no use for a prefit from them as I usually do something that is not SAAMI in the throat when I have them chambered. I think they said blanks were going to be like $80-100 more? Im OK with a $500 blank if the barrel life is doubled. The real "Proof" being in the pudding? Can they build an accurate barrel with this technology? Ray made some pretty big claims, and I would need to see more testing to confirm. There is a reason the Bartlien's, Brux's, etc have walls full of trophy wins, they make really good accurate barrels. Pro shooters arent going to settle for a barrel with double the life, but it shoots worse on paper, even if that worse is only .100" on the 100 yard groups. And yes these barrels are "gain twist" but not exactly what most manufacturers are making today. They are talking about taking a barrel that finishes at a 7 twist and starting it at say a 15 twist. I know Bartlien can do these upon request, but generally most gain twist manufacturers are starting at like a 9 and going to 7 to finish at most as an example. Proof is also doing a different type of rifling which Ray does show in his video. Time will tell on this one. I just rebarreled 2 guns, both with Brux's. The 223 will live a very long service life, but the 6 CM will need replacement in probably 2028. If Proof makes it work as advertised? Ill buy one. If not? Ill buy another Brux or Bartlien. |
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Originally Posted By Kaldor: And yes these barrels are "gain twist" but not exactly what most manufacturers are making today. They are talking about taking a barrel that finishes at a 7 twist and starting it at say a 15 twist. I know Bartlien can do these upon request, but generally most gain twist manufacturers are starting at like a 9 and going to 7 to finish at most as an example. Proof is also doing a different type of rifling which Ray does show in his video. . I don't think that's correct. I think it's a much slower twist than that. So far I haven't seen the actual numbers but in the Proof video I posted he's talking about numbers in hundreds as a starting point. In the Xring video that rifling damn near looks straight when he uses the borescope. I think that's why they used the word Exponential which would make sense if it's starting at 1:100 200 300 etc. |
BikerNut:
Normal people like motorcycles. Real people like motorcycles.
People who don't like motorcycles are just... weird.
Normal people like motorcycles. Real people like motorcycles.
People who don't like motorcycles are just... weird.
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Originally Posted By ALASKANFIRE: I don't think that's correct. I think it's a much slower twist than that. So far I haven't seen the actual numbers but in the Proof video I posted he's talking about numbers in hundreds as a starting point. In the Xring video that rifling damn near looks straight when he uses the borescope. I think that's why they used the word Exponential which would make sense if it's starting at 1:100 200 300 etc. It very well could be way more than a 15. I just put that out there as a number for an example. The real key is will it actually shoot as well as a conventionally rifled barrel, and will they make blanks available? |
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Originally Posted By Kaldor: It very well could be way more than a 15. I just put that out there as a number for an example. The real key is will it actually shoot as well as a conventionally rifled barrel, and will they make blanks available? Originally Posted By Kaldor: Originally Posted By ALASKANFIRE: I don't think that's correct. I think it's a much slower twist than that. So far I haven't seen the actual numbers but in the Proof video I posted he's talking about numbers in hundreds as a starting point. In the Xring video that rifling damn near looks straight when he uses the borescope. I think that's why they used the word Exponential which would make sense if it's starting at 1:100 200 300 etc. It very well could be way more than a 15. I just put that out there as a number for an example. The real key is will it actually shoot as well as a conventionally rifled barrel, and will they make blanks available? Sounds like they've been out and tested for quite a while. I don't see why they wouldn't sell blanks as that's already a big part of their business. |
BikerNut:
Normal people like motorcycles. Real people like motorcycles.
People who don't like motorcycles are just... weird.
Normal people like motorcycles. Real people like motorcycles.
People who don't like motorcycles are just... weird.