NightStalker Posted July 16, 2022 Report Share Posted July 16, 2022 Took the new 308 thumper out today and long story short it failed to lock back and cycle a new round. I figured gas issue on this adjustable gas block and figure maybe I messed up when I installed the gas block somehow. Got it home tear it down and believe the block to be fine. The gas tube extends about 1/2 way across the cam pin notch which should be right. Now I’m wondering if it was a mag issue, and didn’t think to try another mag. I’m so confused lol. Quote Link to comment Share on other sites More sharing options...
308USK Posted July 16, 2022 Report Share Posted July 16, 2022 58 minutes ago, NightStalker said: Took the new 308 thumper out today and long story short it failed to lock back and cycle a new round. I figured gas issue on this adjustable gas block and figure maybe I messed up when I installed the gas block somehow. Got it home tear it down and believe the block to be fine. The gas tube extends about 1/2 way across the cam pin notch which should be right. Now I’m wondering if it was a mag issue, and didn’t think to try another mag. I’m so confused lol. @NightStalker, with the SAFETY ENGAGED and 2 rounds in a mag, can you manually cycle rounds with the charging handle? Quote Link to comment Share on other sites More sharing options...
shooterrex Posted July 16, 2022 Report Share Posted July 16, 2022 If it is new you may just need to shoot a few more rounds till the gas block seals up. What is your recoil system? Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 16, 2022 Author Report Share Posted July 16, 2022 48 minutes ago, 308USK said: @NightStalker, with the SAFETY ENGAGED and 2 rounds in a mag, can you manually cycle rounds with the charging handle? I have not tried this but will when I can get into a safe area. Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 16, 2022 Author Report Share Posted July 16, 2022 20 minutes ago, shooterrex said: If it is new you may just need to shoot a few more rounds till the gas block seals up. What is your recoil system? The recoil system is Aero Precision's M5 Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 16, 2022 Author Report Share Posted July 16, 2022 32 minutes ago, shooterrex said: If it is new you may just need to shoot a few more rounds till the gas block seals up Is this common with the 308 AR’s? I have never had that issue with regular ARs but there is much more power in this platform. Quote Link to comment Share on other sites More sharing options...
shooterrex Posted July 17, 2022 Report Share Posted July 17, 2022 2 hours ago, NightStalker said: The recoil system is Aero Precision's M5 Aero uses 3.something oz buffers. Not enough weight. What is the size of the gas port? Wide open adjustable won't do any good if the port is too small. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 17, 2022 Report Share Posted July 17, 2022 (edited) 2 hours ago, NightStalker said: The recoil system is Aero Precision's M5 Rifle Recoil System? Carbine Recoil System? "Aero M5" has both. Yes, carbon fouling in order to form a gas seal is normal. How many rounds out of this gun so far? Total... These aren't AR15s... Edited July 17, 2022 by 98Z5V Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 17, 2022 Author Report Share Posted July 17, 2022 3 hours ago, 98Z5V said: Rifle Recoil System? Carbine Recoil System? "Aero M5" has both. Yes, carbon fouling in order to form a gas seal is normal. How many rounds out of this gun so far? Total... These aren't AR15s... Recoil system- Aero M5 carbine Round count- 42 Not sure about the gas port size and that’s a great point I didn’t think about. I can tell you I checked to see if it was blocked with a 1/16 punch slips in it. What size port should it be? I took it back out this afternoon and it was loosening up and cycling like it should. It still failed to hold open on the last round. I know it’s not broken in yet Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 17, 2022 Report Share Posted July 17, 2022 28 minutes ago, NightStalker said: Recoil system- Aero M5 carbine Round count- 42 Not sure about the gas port size and that’s a great point I didn’t think about. I can tell you I checked to see if it was blocked with a 1/16 punch slips in it. What size port should it be? I took it back out this afternoon and it was loosening up and cycling like it should. It still failed to hold open on the last round. I know it’s not broken in yet Gonna need details on the whole gun, just like we tell everyone else that states operational issues. Start by reading this - and comply with the details needed... YOU have to tell US what you have - so we know what we must work with. That, right there, is the very "step 1" in the whole process. Otherwise, it's just guess-work. Read this: Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 17, 2022 Author Report Share Posted July 17, 2022 Ok here’s the complete run down on this rifle: Upper- Aero Precision standard upper Barrel- Ballistic Adv. 16 in 1/10 mid length gov cut BCG- Ballistic Adv. Charging handle: Aero Precision Gas Block- Seekins Adjustable Gas Tube- 113/4 in mid length HG- Midwest industry 12 free float Lower- Aero Precision Buffer- Aero Precision mil spec 308 carbine buffer tube with carbine spring and weight parts kit- Aero Precision with Mag Pull grip Butt Stock- MagPul ACS Adaptable Carbine I tried to keep everything Aero or Ballistic Advantage with the major parts since the two companies are related the Seekins gas block was used because I was familiar with them since they work great on my other builds Also not trying to be a smart a** thought this would be a good place fo a complete list all the parts in it just for my records. I think that’s everything Quote Link to comment Share on other sites More sharing options...
shooterrex Posted July 17, 2022 Report Share Posted July 17, 2022 That recoil system is not good. You need a heavier buffer and a proper spring. Still need to know what diameter you gas port is? Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 17, 2022 Author Report Share Posted July 17, 2022 39 minutes ago, shooterrex said: That recoil system is not good. You need a heavier buffer and a proper spring. Still need to know what diameter you gas port is? What recoil would you recommend? I’ll have to call BA tomorrow, no time today to tear the GB off to measure the gas port. Quote Link to comment Share on other sites More sharing options...
shooterrex Posted July 17, 2022 Report Share Posted July 17, 2022 https://www.armalite.com/SACItem.aspx?Item=AR10REKIT01&ReturnURL=/Armalite/Product-Category/AR10-Parts-Accessories/Lower-Receiver-Parts&Category=ac614400-ff09-4cdf-9d35-419a654e7201 Quote Link to comment Share on other sites More sharing options...
shooterrex Posted July 17, 2022 Report Share Posted July 17, 2022 Aero can tell you what they think the gas port diameter is but the only way to know for sure is to measure it yourself. Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 17, 2022 Author Report Share Posted July 17, 2022 1 hour ago, shooterrex said: https://www.armalite.com/SACItem.aspx?Item=AR10REKIT01&ReturnURL=/Armalite/Product-Category/AR10-Parts-Accessories/Lower-Receiver-Parts&Category=ac614400-ff09-4cdf-9d35-419a654e7201 So if there’s not enough gas and I put a heavier buffer and spring in it, won’t it short stroke? Quote Link to comment Share on other sites More sharing options...
shooterrex Posted July 17, 2022 Report Share Posted July 17, 2022 Yep they need to be balanced. The Armalite parts just work if your gas system is correct. The bolt not locking back w/a light buffer tells us your gas port is too small. When you open that up it will overpower the light recoil system causing other function problems. Both ends of the gun have to work together. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 18, 2022 Report Share Posted July 18, 2022 3 hours ago, NightStalker said: So if there’s not enough gas and I put a heavier buffer and spring in it, won’t it short stroke? Read this, man... Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 18, 2022 Author Report Share Posted July 18, 2022 Ballistic Advantage said the gas port should be .0730, and if I figured it right isn’t that between 1/16 and 5/64? Ya I’m not good with math anymore lol. Quote Link to comment Share on other sites More sharing options...
shooterrex Posted July 18, 2022 Report Share Posted July 18, 2022 https://www.google.com/imgres?imgurl=https%3A%2F%2Fi.pinimg.com%2Foriginals%2F86%2Fcc%2F77%2F86cc774c07605d94f459484dbc8487fa.png&imgrefurl=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F452119250066062019%2F&docid=bEJSWzIIARIMAM&tbnid=-gmUVjD3dp8pNM&vet=1&w=340&h=767&itg=1&hl=en-US&source=sh%2Fx%2Fim Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 18, 2022 Author Report Share Posted July 18, 2022 That helps, I’ll check the hole size tonight and post what I find. Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted July 19, 2022 Report Share Posted July 19, 2022 6 hours ago, NightStalker said: That helps, I’ll check the hole size tonight and post what I find. Things you can say about your gun but not your wife/girlfriend. Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 19, 2022 Author Report Share Posted July 19, 2022 1 hour ago, Armed Eye Doc said: Things you can say about your gun but not your wife/girlfriend. Bahahaha ya that could be an issue lmao 🤣 Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 19, 2022 Author Report Share Posted July 19, 2022 Looking at the gas port 1/16 to small 5/64 is to large so I’d say it’s .0730. What size should it be for proper operation? Quote Link to comment Share on other sites More sharing options...
NightStalker Posted July 24, 2022 Author Report Share Posted July 24, 2022 Update did some gas chamber work on it this last week and took it out yesterday. It did great after a couple turns on the gas block, including locking back. I want to thank all who gave input And guidance. It is greatly appreciated Quote Link to comment Share on other sites More sharing options...
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