survivalshop Posted June 17, 2017 Report Share Posted June 17, 2017 (edited) I'm starting a thread on this in hopes the STAFF here will make it Pinned . Only info needed here is if you know your Barrels Port size , post it here , with Manufacturer , Gas system length & Barrel length & if you had to make any changes to it to make it work if you had issues. Kreiger Criterion 308 ,16" HB , Rifle Gas system ------ 0.1095 " Sharps , 25-45 Sharps , 20" LT , Rifle gas system ---- 0.09375" Here is some info from Tactical Machining AR-15 GAS PORT SIZES Disclaimer: These are lists of compiled information from multiple sources. While we make our best effort to test and produce these should be considered for reference only. Any time you start messing with the gas port on your rifle you run the risk of destroying the barrel or causing it to be over gassed. It is much better to slowly work your way up to what you would be happy with. AR-15 Platform 5.56mm 20" rifle 5.56 0.0935 20" rifle 5.56 0.096 20" rifle 5.56 0.098 16" mid 5.56 0.078 16" mid 5.56 0.081 16" car 5.56 0.0625 16" car 5.56 0.065 16" car 5.56 0.07 14.5" car 5.56 0.067 14.5" car 5.56 0.086 11.5" car 5.56 0.081 11.5" car 5.56 0.089 24" rifle 5.56 0.089 AR-15 Platform 7.62x39mm Conversion 20" rifle 7.62x39 0.12 20" rifle 7.62x39 0.125 16" car 7.62x39 0.078 16" car 7.62x39 0.081 16" car 7.62x39 0.0938 DPMS LR-308 Style Rifle 18" rifle 0.308 0.0960 18" car 0.308 0.0635 16" mid 0.308 0.078 16" mid 0.308 0.081 16" car 0.308 0.07 16" car 0.308 0.073 16" car 0.308 0.076 20" rifle 0.308 0.0935 20" rifle 0.308 0.096 AR-15 Platform 300 BLK Conversion Subsonic Ammo 16" car 300 BLK UNSUPRESSED 0.12 16" car 300 BLK UNSUPRESSED 0.125 16" car 300 BLK SUPRESSED 0.106 16" car 300 BLK SUPRESSED 0.11 16" pistol 300 BLK UNSUPRESSED 0.067 16" pistol 300 BLK SUPPRESSED 0.086 9.5" pistol 300 BLK UNSUPRESSED 0.093 9.5" pistol 300 BLK SUPPRESSED 0.093 8.1" pistol 300 BLK UNSUPRESSED 0.104 8.1" pistol 300 BLK UNSUPRESSED 0.12 8.1" pistol 300 BLK SUPRESSED 0.086 8.1" pistol 300 BLK SUPRESSED 0.093 AR-15 Platform 300 BLK Conversion Supersonic Ammo 16" pistol 300 BLK UNSUPRESSED 0.0625 16" pistol 300 BLK SUPPRESSED 0.059 16" car 300 BLK UNSUPRESSED 0.099 16" car 300 BLK SUPPRESSED 0.093 9.5" pistol 300 BLK UNSUPRESSED 0.073 9.5" pistol 300 BLK SUPPRESSED 0.067 8.1" pistol 300 BLK UNSUPRESSED 0.076 8.1" pistol 300 BLK SUPPRESSED 0.067 The 300 Blackout data has been compiled from Micro MOA Edited June 23, 2017 by survivalshop Quote Link to comment Share on other sites More sharing options...
98Z5V Posted June 17, 2017 Report Share Posted June 17, 2017 Armalite AR-10 barrel, 13.5" OAL, midlength gas system, gas port diameter 0.081". Quote Link to comment Share on other sites More sharing options...
washguy Posted June 17, 2017 Report Share Posted June 17, 2017 16 inch barrels of many different makes and a lonely 18 inch barrel all are mid length all at .081 Wash Quote Link to comment Share on other sites More sharing options...
shepp Posted June 17, 2017 Report Share Posted June 17, 2017 Done you guys create I'll moderate ?? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 10, 2017 Report Share Posted July 10, 2017 5.56 info here- Ballistic Advantage .223 Wylde SPR barrel: 18" .223 Wylde SPR Stainless Steel Rifle Length AR 15 Barrel w/ Ops 12, Premium Series, 1:8" twist Gas port diameter: 0.095" Quote Link to comment Share on other sites More sharing options...
survivalshop Posted October 9, 2017 Author Report Share Posted October 9, 2017 From 308KIKI FWIW, dunno if you guys want to add this to the "gas port dia thread", AR 243, 20" barrel, Rifle gas system, gas port dia .095" Works a treat Quote Link to comment Share on other sites More sharing options...
survivalshop Posted January 7, 2018 Author Report Share Posted January 7, 2018 From 98's 6.5 build , 18" SS Ballistic Advantage SPR Barrel http://ballisticadvantage.com/18-inch-65-grendel-spr-rifle-ss-premium-barrel.html 6.5 Grendel Mk 12 SPR profile, heavy stainless, rifle gas, measured out a 0.100" gas port diameter. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 7, 2018 Report Share Posted January 7, 2018 (edited) Another 6.5 Grendel barrel spec: Faxon Firearms 6.5 Grendel gas port info: Match Series- 18" Gunner, 6.5 Grendel, MIDLENGTH GAS SYSTEM, 416-R, 5R, Nitride, Nickel Teflon Extension - Gas Port diameter = 0.077". Edited January 8, 2018 by 98Z5V Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 27, 2018 Report Share Posted July 27, 2018 (edited) PSA 18" Stainless .308 barrel, "midlength" gas system. 0.073" fits, 0.076" does not fit. This gas port is too small. Edited July 27, 2018 by 98Z5V Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 27, 2018 Report Share Posted July 27, 2018 Found the thread with our original gas port data: Found it by looking for this chart, that I knew I'd seen here. .308 min and max gas port sizes, by barrel length, from one specific reputable manufacturer: Quote Link to comment Share on other sites More sharing options...
98Z5V Posted August 8, 2018 Report Share Posted August 8, 2018 (edited) Rainier Arms Select .308 barrel, stainless, 18", true AR15 midlength gas system. Gas port diameter 0.081". Edited August 8, 2018 by 98Z5V Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted October 5, 2018 Report Share Posted October 5, 2018 (edited) .308 win 16 inch rifle gas(AR15rifle), X-Caliber barrel ended up at .1005", runs everything there. Edit; .750" diameter at the gas block. Edited April 28, 2019 by jtallen83 Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 1, 2019 Report Share Posted January 1, 2019 .260 Remington info: Wilson Combat .260 Remington Tactical Hunter barrel, 20" rifle gas,1:8" twist. Recessed 11-degree target crown. 416R stainless. Gas port diameter is 0.071". Weight is 1205 grams/42.5 oz/2.65lbs. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 10, 2019 Report Share Posted January 10, 2019 Courtesy of 308kiwi: Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted April 28, 2019 Report Share Posted April 28, 2019 Wilson Combat .338 Federal Gas Port Size .0705" by my chinese calipers on my chinese drill bits............. Gas Block Seat .750" Diameter Gas System Intermediate-Length (13.25") the tube delivered with the barrel was actually 13 3/16" by my Stanley tape. Length 14.7" Rifling 1:10, RH, Six Groove, Precision Button Rifling Quote Link to comment Share on other sites More sharing options...
98Z5V Posted April 29, 2019 Report Share Posted April 29, 2019 22 hours ago, jtallen83 said: Intermediate-Length (13.25") the tube delivered with the barrel was actually 13 3/16" by my Stanley tape. Very interesting, brother... Quote Link to comment Share on other sites More sharing options...
98Z5V Posted May 13, 2019 Report Share Posted May 13, 2019 Metric Shiit-Ton of 5.56 gas port diameters: https://docs.google.com/spreadsheets/d/1tXunBDX5Gaz87BqxwNxDUlWNK9nEv-cZEQoLq2JXXrk/htmlview Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 15, 2020 Report Share Posted January 15, 2020 Ballistic Advantage Modern Series, Mk12 profile, 5.56 chamber, 1:7" twist. 18" 5.56 SPR Rifle Length AR 15 Barrel w/ Ops 12, Modern Series This one: https://www.ballisticadvantage.com/18-inch-556-spr-rifle-cmv-modern-barrel-ops12.html Gas port diameter is 0.095", 18" 5.56 barrel, rifle gas. This is very close to what an 18" rifle gas .308 Win barrel needs to be. Here's the barrel referenced: Quote Link to comment Share on other sites More sharing options...
98Z5V Posted May 26, 2020 Report Share Posted May 26, 2020 (edited) 12.5" SIG 716 .308Win piston-system barrels - that we run as DI Gas Guns... These are were the CDNN blow-out barrels for $49.95. Mine was a 12.5" barrel with a 0.750" journal diameter, 0.070" gas port diameter. Dwell time measurement on my barrel was 3.500", center of gas port to end of barrel crown - this might be important later, because you carefully need to measure YOURS. On that barrel config, I needed a gas tube that was exactly 11.000" long. Perfect calculation and measurement, once the custom gas tube arrived from White Oak Armament. Gas tube was perfect, and WOA nailed what I asked them to do/make. Functional test - this 0.070" gas port diameter gonna work on a 12.5" barrel, with a 3.500" dwell time?... First round lock back, virgin gun, lubed properly, one round in the mag. Gas port was right on it. This gun runs. Recoil system details are: 7.000" internal depth AR15 receiver extension (what comes with the SBA3 kit), hybrid (home-cobbled) 2.500" buffer that's 5.7oz, and a Sprinco Orange spring. There are some people reporting, and posting accurate verified pics, of needing a gas tube length that was 11.250". That's a longer gas tube, and that shortens dwell time, on an already shortass barrel. No details on their recoil systems, but that's something to be aware of - if you HAVE one of these barrels, you better measure three times before you order a custom gas tube. And the only place on the planet that is making custom AR gas tubes is White Oak Armament. If you're building one of these, pay attention... Edited May 26, 2020 by 98Z5V Quote Link to comment Share on other sites More sharing options...
RedRiverII Posted May 26, 2020 Report Share Posted May 26, 2020 Thanks guys. Checking out my 7.62 from the blow out sale. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted May 26, 2020 Report Share Posted May 26, 2020 8 hours ago, 98Z5V said: And the only place on the planet that is making custom AR gas tubes is White Oak Armament And Al's shop when he can't wait for the nationals to finish and WOA to get back to work! Mine came out perfect at 11-3/16" If I remember right. Had to open the port up a bit, think I ended up with .079 and backed down just a bit w/ AGB. Ditto on Orange spring and 5.6 buffer. Also ran fine with the longer extension/ buffer and a Tubbs spring w/ AGB a little closer to W/O. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted June 22, 2020 Report Share Posted June 22, 2020 6mm ARC. Ballistic Advantage Mk12 SPR profile barrel, 18" rifle gas. Gas port diameter is 0.097". Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 15, 2021 Report Share Posted March 15, 2021 From Eric @ARTrooper- Faxon 6 ARC 16" midlength gas barrel, 0.750" journal diameter, 0.760" gas port diameter. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted March 28, 2021 Report Share Posted March 28, 2021 BSF 6.5 Grendel 18 inch with rifle gas, .875 journal diameter, .093 gas port diameter. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 28, 2021 Report Share Posted March 28, 2021 10 hours ago, jtallen83 said: BSF 6.5 Grendel 18 inch with rifle gas, .875 journal diameter, .093 gas port diameter. That's gonna work, brother. Quote Link to comment Share on other sites More sharing options...
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