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- #21
Used a combination of drill bits and a digital caliper. No where near .096". A .078" bit will not fit in the hole.Did you use a pin gauge?
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Used a combination of drill bits and a digital caliper. No where near .096". A .078" bit will not fit in the hole.Did you use a pin gauge?
If you drill it out, don't use a regular drill bit...as it'll push debris into the barrel. People think they can shoot it out, but what is still attached to the barrel is harder than copper and lead and will obviously cause accuracy issues.Used a combination of drill bits and a digital caliper. No where near .096". A .078" bit will not fit in the hole.
That seems small.I just measured my gas port at about .062". According to what I'm seeing on a cursory Google search it should be about .096" for an 18" .308 rifle length barrel. WHOA am I missing something here???
I ran an A5 with my rifle length and it was such a pleasant shooter. Loud AF with the little bastard muzzle break but a light recoil impulse. Should give it a try!I had the same question as I just built an AR15 rifle with carbine buffer. Lots of people run rifle length gas systems in the AR15 with a carbine length buffer without issue. I dont know about AR10s builds.
My guess is with an adjustable gas block and maybe the right buffer weigh it should be fine?
Yea…Aero support is useless.Sig 716 308 run a standard AR-15 type buffer system.
Me thinks the Aero person was reading from a script.
Make sure he's not a hack that is going to use a handyman drill bit that leaves a nice burr inside your barrel.I learned two things: (1) I should be able to use either style of buffer system and (2) my gas port is too small.
It seems that due to the lack of .308 AR standardization, manufacturers make their ports small with the unspoken undersanding they will be enlarged as needed by the builder/gunsmith.
Almost no manufacterers list their port sizes on factory barrels but many web-wide posters cite short-stroking issues, claiming ports somewhere between .062" and .075" from the factory.
I'm seeing pretty consistent information indicating the correct port size for my barrel (18" .308 with a .75" journal and rifle length gas system) to be between .089" and .096".
I think I will probably have my local smithy ream it to .089" and see where that takes me.
Usually Rifle gas plus CAR tube/spring means heavy buffer--H3 for semi only or H6 for full-auto IIRC. (H6 is what's in the "official" USGI M16 telestock conversion kit; same weight as an H3 or rifle buffer but biasing springs (IIRC) inside to dampen and tune harmonics.) C7A2 runs a heavier buffer too IIRC, per the CF gunplumbers who've helped me setup my gal's iron to CF spec.Agreed that Aero's telling you something they were told to tell.
FWIW.... the Navy SEALS got a Recon Rifle in 16" with carbine gas and fixed A1/A2 rifle buffer. There's also the Canadian C7A2 20" rifles that have the Carbine stocks...
Don't ask me why they called it that.H6 ? !!!
I just wanted to post an update. I had the gas port reamed from .062" to .098" and like magic it runs like a top. Problem solved! Now I just need to upgrade to that Geissele trigger so I can hit something....I just measured my gas port at about .062". According to what I'm seeing on a cursory Google search it should be about .096" for an 18" .308 rifle length barrel. WHOA am I missing something here???
So it sounds like the buffer assembly type doesnt have anything to do with the rifles gas length, even in 308/AR10 builds?Carbine vs. rifle buffer assembly. Everybody says they know what they're talking about but I believe few people really do. The question is whether the buffer assembly type has a correlation to the gas length, specifically on an AR10/.308.
It's more about the "balance" of several elements.So it sounds like the buffer assembly type doesnt have anything to do with the rifles gas length, even in 308/AR10 builds?
so then no...It's more about the "balance" of several elements.
Gas port size
Dwell time (barrel length forward of gas port)
Buffer weight
Recoil spring power
Ammo (pressure)
FWIW, it seems to be confirmed that gas port size is more important than buffer system setups, and more important than gas length system although these two are very much linked to each other.It's more about the "balance" of several elements.
Gas port size
Dwell time (barrel length forward of gas port)
Buffer weight
Recoil spring power
Ammo (pressure)
Yo obviously are unfamiliar with the concept of 11.As Brandon would say, that is a bunch of malarkey, it all boils down to the size of the gas port. Something to keep in mind about adjustable gas blocks, they will only decrease your available gas they are incapable of increasing it.
Yeah, totally. I started out at 3 turns from fully closed and it would eject but not lock back. Same with 4. At 5 turns it was ejecting, locking back and throwing the brass at about 4:00. Perfect. As near as I can tell, 5 1/2 turns on my AGB is fully open, so I don't really need one.As Brandon would say, that is a bunch of malarkey, it all boils down to the size of the gas port. Something to keep in mind about adjustable gas blocks, they will only decrease your available gas they are incapable of increasing it.