Tuflehundon Posted January 23, 2018 Report Share Posted January 23, 2018 I know in AR15's the longer gas systems make the gun shoot softer when tuned. We tune the crap out of our 3gun rifles. How much of a difference does it make in a 308 rifle? I ask because a guy is selling a Faxon 308 18" mid length heavy barrel with a fairly low round count. (under 1000) The cost is under 1/2 of new. If I buy new, I'd get the 20" heavy fluted Faxon http://faxonfirearms.com/match-series-18-heavy-fluted-308-win-5r-416r-nitride-nickel-teflon-extension/ Or the Criteron M110 20" heavy barrel http://www.fulton-armory.com/barrelfatitan20nmm110ss1x12875gasblockthreaded.aspx The used barrel is listed at $100 shipped Quote Link to comment Share on other sites More sharing options...
sketch Posted January 23, 2018 Report Share Posted January 23, 2018 i have a midlength in 16" it shoots good. at half the cost it would be a worth wile purchase.. gurus will chime in soon. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted January 23, 2018 Report Share Posted January 23, 2018 I have a 16 inch with rifle length gas system, shoots softer than my 20 inch AR-10 but then I started with a SLR adjustable gas block from the start. Sounds like a pretty good deal on the Faxon, you can always add an adjustable block and tune it down to a minimum. Quote Link to comment Share on other sites More sharing options...
mineralman55 Posted January 23, 2018 Report Share Posted January 23, 2018 11 hours ago, jtallen83 said: I have a 16 inch with rifle length gas system Who makes that? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 23, 2018 Report Share Posted January 23, 2018 Criterion is one company. I don't know of too many others that make that configuration. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted January 23, 2018 Report Share Posted January 23, 2018 Before the adjustable GB’s came out, I was a huge advocate of “the longest gas system that can fit on a barrel”. A midlength gas on a 12.5” to 14.5” has been done successfully by several companies. The .308 has a LOT of gas. There’s no reason at all why it shouldn’t work. When I designed my CF wrapped barrel, I argued with Proof Research about whether or not it’d work. Seven years later, plinking Mil surplus to high grade match... never a hiccup. I still have never put a drop of oil on it!!! Understanding weight enertia, and expansion and control of gas, makes the machine run properly. You might have to bore out the gas port to about .100 to .110... no worries though. The GB usually has a .125 hole inside. I have two 16” rifle length barrels (on piston systems) and one 17” rifle length (on a DI system). The 16’s are at .110 and the 17 is at .099 Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted January 23, 2018 Report Share Posted January 23, 2018 I have not used a adj GB yet. It seems more like a fix for people who buy off the shelf rifles, and are upset with stock performance. I believe an adj GB could further dial in a well built rifle, but at the sacrifice of being VERY ammo specific. If I were competing in +1k long range competition, then I might consider it for the added benefit. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted January 23, 2018 Report Share Posted January 23, 2018 7 hours ago, mineralman55 said: Who makes that? X-Caliber made mine, custom ordered. Thanks to the gurus here the required gas port size was eventually attained, came way undergassed. have to say I would recommend the Criterion. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted January 24, 2018 Report Share Posted January 24, 2018 (edited) Seems they have answered you question . I personally will not build a 308AR with out a Rifle gas system & I have never used an Adj. GB ( disclaimer < I have an AR 15 build with a Superlative Arms Piston system & I didn't have a choice thats its adjustable, its the way it came & I wanted to try a Piston system & I really like it , the whole rifle ) Edited January 24, 2018 by survivalshop Quote Link to comment Share on other sites More sharing options...
Tuflehundon Posted January 24, 2018 Author Report Share Posted January 24, 2018 13 hours ago, survivalshop said: Seems they have answered you question . I personally will not build a 308AR with out a Rifle gas system & I have never used an Adj. GB ( disclaimer < I have an AR 15 build with a Superlative Arms Piston system & I didn't have a choice thats its adjustable, its the way it came & I wanted to try a Piston system & I really like it , the whole rifle ) My 3gun AR is an Adams Arms piston gun. Low mass operating system, adj GB, adj JP silent captured spring, the works. But it's a race gun tuned specifically for my ammo. I want this to be a hunting rifle and range toy. Don't want to tune it as much. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted January 24, 2018 Report Share Posted January 24, 2018 (edited) On 1/24/2018 at 8:52 AM, Tuflehundon said: My 3gun AR is an Adams Arms piston gun. Low mass operating system, adj GB, adj JP silent captured spring, the works. But it's a race gun tuned specifically for my ammo. I want this to be a hunting rifle and range toy. Don't want to tune it as much. Do you think you will need to tune a Rifle length Gas system ? Edited January 25, 2018 by survivalshop Quote Link to comment Share on other sites More sharing options...
mineralman55 Posted January 24, 2018 Report Share Posted January 24, 2018 16 hours ago, survivalshop said: I personally will not build a 308AR with out a Rifle gas system & I have never used an Adj. GB Other than rifle-length gas systems do work. My first 308AR was with a rifle length gas system with an adjustable gas block. It worked fine. My second and third were both mid-length with adjustable gas blocks. They didn't function right at first, but it turned out to NOT be the gas system's fault. I screwed up (don't grease the BCG cam pin. it gums up the action . Lightly oil it.) After I fixed that, both mid lengths have run flawlessly with lots of reloads and commercial ammo. I'd take either mid-length rifle anytime I had to have something that absolutely had to work. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted January 24, 2018 Report Share Posted January 24, 2018 4 hours ago, mineralman55 said: (don't grease the BCG cam pin. it gums up the action . Lightly oil it.) I grease everyone of mine , might depend on the grease & outside temps with some grease .I also put grease on the bottom & sides of the Carrier , where the Hammer will ride & the rails of the Carrier , I use Red & Tacky Synthetic Grease , has never had an issue . On new Builds I put a very small dab on the back Of the Bolt Lugs at first testing . Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted January 25, 2018 Report Share Posted January 25, 2018 Same hear,I grease the cam and gas rings. Used to lightly grease the carrier rails but switched to EWL30 and now the special stuff. Used weapon shield, slip grease, and Enos slide glide, never had an issue. Quote Link to comment Share on other sites More sharing options...
Tuflehundon Posted January 26, 2018 Author Report Share Posted January 26, 2018 On 1/24/2018 at 10:25 AM, survivalshop said: Do you think you will need to tune a Rifle length Gas system ? Wasn't planning to tune it the way I did my 3gun rifle. I just want it to work and be reliable. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 26, 2018 Report Share Posted January 26, 2018 (edited) 2 hours ago, Tuflehundon said: Wasn't planning to tune it the way I did my 3gun rifle. I just want it to work and be reliable. Well, I've got 4 or 5 of these things now. None of them have adjustable gas blocks, just standard gas blocks. None of them have fancy recoil systems - one is a DPMS rifle recoil system, but with an Armalite EA1095 spring. The others all run Armalite AR-10 Carbine recoil systems. Regular gas tubes, one rifle length gas system, the others are mid. They run, no issues, no tuning required. Bought decent barrels, and haven't even had to drill a gas port in any of them. Edited January 26, 2018 by 98Z5V Quote Link to comment Share on other sites More sharing options...
survivalshop Posted January 26, 2018 Report Share Posted January 26, 2018 11 hours ago, Tuflehundon said: Wasn't planning to tune it the way I did my 3gun rifle. I just want it to work and be reliable. Mid or Rifle on a 308AR if Quality Barrels & THE PROPER BUFFER SYSTEM used , should work with out any fancy mod's , the Mid will have a slight increase in felt recoil , but nothing to speak of . I just believe the Rifle Length Gas system is a smoother running Action . Quote Link to comment Share on other sites More sharing options...
Tuflehundon Posted January 28, 2018 Author Report Share Posted January 28, 2018 On 1/26/2018 at 7:03 AM, survivalshop said: Mid or Rifle on a 308AR if Quality Barrels & THE PROPER BUFFER SYSTEM used , should work with out any fancy mod's , the Mid will have a slight increase in felt recoil , but nothing to speak of . I just believe the Rifle Length Gas system is a smoother running Action . The guy that had the mid gas barrel listed sold it. SO now I'm pretty much set on the Faxon 18" heavy fluted barrel. Just gotta save up for it. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted January 28, 2018 Report Share Posted January 28, 2018 Might be better off breaking in a new Barrel , your way . Unless you knew the seller personally , you never know what condition the barrel is really in . Quote Link to comment Share on other sites More sharing options...
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