jlbell

Jgun, send me your email address and I'll email you a couple pics of the rifle. jerrybell@mindspring.com

Running a suppressor, you get a lot of blowback! It holds a lot of gas/powder, etc. in and back pressure sends it back up the barrel. I always run the PRi Gas Buster charging handle which redirects the blowback out of your face. So, yes, the gun runs dirtier. But no, I don't think that is the problem with having to lube. It's just that all parts are brand new and it needs to wear in. Shot another 65 rounds Friday, all suppressed, without any problems. Heavier buffer probably would soften the bolt recoil, but after this Friday, it doesn't seem to be a real problem. And yes Carbine length gas system is just the standard AR15 carbine length (approx. 7 1/2"). Rifle worked well this week and is a lot of fun to shoot. Weight is good (unsuppressed), recoil is mild, accuracy seems good (bowling pins at 50 yds.), with red dot. Right now the only negative, for me, is that the YHM Steel Suppressor is a little heavy at the end of the barrel. A Titanium Suppressor will lighten it up right at a pound, which will really make a difference.

No, it states Carbine length gas system. The Gas Block adjustment has been screwed in, but gets tight or is hitting on the gas tube. Something is preventing it from screwing in far enough to cut the gas flow. Just haven't had time to look at it yet. My chart shows min. port size (for 11.5" barrel) as .086" and .094" as max. Even though my barrel is 12.5" long this range should still work fine (14.5" barrel uses a smaller port size; .063" - .078"). I just picked something in the middle of the 11.5" barrel port size range (.090"). Port size was not as critical since I planned on using an adjustable gas block. The only reason I believe I could get by with the .086" gas port is that it just feels as if the bolt is blowing back a little hard. That is completely subjective, with absolutely no basis in anything scientific or measurable. I just believe it would cycle (using 7.62 Surplus ammo) with the minimum .086" port size. Suppressor is a YHM Q.D. Phantom. Suppressor works fine, rifle cycles every time, and no hearing protection is required. Sounds a lot like disconnecting a large air hose. It could be shot indoors without hearing protection (even though it would be louder). Because of the YHM weight (28.6 oz.) I want to run a Titanium .308 can (13 oz.). Hope to pick one up in the near future. I do not build rifles for a living and all of this is the things that I thought would work. It, just as easily, could have gone the other direction. I think once the bolt gets worked in it will be fine. 65 rounds through it a couple weekends ago. Plan to run another 65 - 100 rounds through it tomorrow. I figured 300 rounds or so should wear the bolt/upper receiver in and hopefully keep from having to spray (lube) the bolt so much. I am very pleased with the outcome and the rifle is a blast to shoot. Unsuppressed it is loud, suppressed it is reasonably quiet and could be shot all day without hearing protection. Id post a pic, but have not had time to read the instructions. Maybe I can post a pic later.

I'll try and figure out how to post pics after the holiday!

Just an FYI: LR-308 Barrel was cut (12.5"), recrowned, threaded, contoured (.933") 1.875" in length for adjustable (.936") JP Ent. Gas Block then contoured (.857") fwd of gas block to muzzle. Gas Port drilled .090" for carbine length gas system. Rifle comes in at 9 lb. 10.4 oz. W/Armson optic & carry handle. Rifle runs fine with surplus 7.62 ammo, both suppressed and un-suppressed. All parts were new and bolt needs to be sprayed with lube (CLP, etc.) fairly often. Parts are not worn in, yet, so has to be lubed. May have oversized the gas port just a bit. After running the weapon, .086" was probable big enough. But I'm very pleased with outcome!!!!!!!!!!!!!!

Could be the difference between the triggers, but I am using an AR Gold. Biggest problem was I beleive the round did not full seat in the chamber. I dont think the bolt completely locked up. Then there was the problem of the round sticking in the chamber. Had to beat the charging handle back to extract the unfired round. All is good, rifle was not built for Surplus and has since been sighted in (GMM 168 gr.).

Jgun I have not checked on Silencer Talk yet, but will. With limited knowledge on running the 12" 7.62 barrel, I was thinking Carbine length or a little shorter. I want to run a standard length, not a one of a kind set-up, so figured using an adjustable gas block would give me some room to adjust for reliability.

This may belong in the Class III section, but it is a technical question! I plan to build an AR .308 SBR (Happen to have the 20" barrel out of a DPMS Classic - 129 rnds. fired) and I want to toy around with a Semi-Auto .308 SBR. Barrel will be cut to 12", gas port re-drilled, and the gas block area forward turned down to .750", with muzzle rethreaded. My question is which gas system length would work best? Obviously I cant use rifle length and not sure about mid-length, maybe Carbine length (?). Rifle will be shot suppressed at all times and used with surplus plinking ammo. I have a new JP Enterprises adjustable gas block (.750") to use. Any suggestions? Thanks,

two weekends ago I carried a new build LR-308 (heavy (new) 24" S.S. .308 bbl cut back to 20" and profiled for an OPS Inc 3rd Model Suppressor, running a JP Ent. adjustable gas block). Thought I'd use surplus to get it on paper. Nope, that didnt work! First round didnt go off. Had to tap the charging handle back to extract the unfired round. Locked up tight! Primer had the slightest dimple in it. Tried a second round (without much thought), same problem. My .308 chamber is too tight to feed surplus ammo. Shoots fine with Fed. 168gr. Gold Medal Match.