By the ocean?
That's just what he told me the ranch he lives on has a seagull problem. He's like 80 years old so he might be shooting chickens for all I know.
Screaming Deals on Armalite Barrels
- Thread starter JS8588
- Start date
That's just what he told me the ranch he lives on has a seagull problem. He's like 80 years old so he might be shooting chickens for all I know.
Another update on the 11.5 Armalite. I went to a 100 yard range today with more GGG M193 and some AAC 77gr OTM and a chronograph.
Unfortunately, I didnt think about putting a bigger scope on it, so all shooting was done with the TA11 I had on top of it.
I thought the chrono numbers looked pretty good. I used 10 shot strings.
M193 - 2763 vel. 16.5 SD 59.9 ES
AAC 77gr - 2282 vel. 17.7 SD 43.3 ES
Neither of the types of ammo I used were match grade by any means, but they were pretty consistent.
Groups with the M193 ran in the 2 to 2.5 MOA range. At least I know from yesterday that it shoots well enough to put hits on reduced size IPSC targets at 400.
The AAC 77gr shot into the MOAish range. MOA give or take. This is the same result that I get out of my 16" Criterion Hybrid barrel, so Im happy with that. I just wish I got a bit more velocity out of it. I think this lot of AAC was underpowered.
I was running the gas block with the .066 gas port and the AAC failed to lock back on the last round. I put the block with the .070 port back on when I got home, just to be sure.
Unfortunately, I didnt think about putting a bigger scope on it, so all shooting was done with the TA11 I had on top of it.
I thought the chrono numbers looked pretty good. I used 10 shot strings.
M193 - 2763 vel. 16.5 SD 59.9 ES
AAC 77gr - 2282 vel. 17.7 SD 43.3 ES
Neither of the types of ammo I used were match grade by any means, but they were pretty consistent.
Groups with the M193 ran in the 2 to 2.5 MOA range. At least I know from yesterday that it shoots well enough to put hits on reduced size IPSC targets at 400.
The AAC 77gr shot into the MOAish range. MOA give or take. This is the same result that I get out of my 16" Criterion Hybrid barrel, so Im happy with that. I just wish I got a bit more velocity out of it. I think this lot of AAC was underpowered.
I was running the gas block with the .066 gas port and the AAC failed to lock back on the last round. I put the block with the .070 port back on when I got home, just to be sure.
The whole thing with the 1/2x28 threads on a heavy barrel has always been something that bothered me. I've heard the notion of mitigating this with a muzzle device. What also worries me is overtightening the muzzle device and I dont think I've ever found a definitive torque spec on muzzle devices. If it matters, I always time my muzzle devices with shims.
As for controlling gas, we'll have to agree to disagree regarding using springs to affect closed bolt lock time. Nevertheless, I do agree that controlling gas flow is the way to go. Although I'm trying to get away from using "controls", my chosen method thus far has been riflespeed gas blocks. I think they truly are the best thing going.
Yeah, after learning about how the AMU went through a lot of testing with muzzle device effects on precision, I’m a fan of low or no torque using shims and Rocksett on muzzle devices. Adding counteractive axial force via torque on threads to the smaller diameter muzzle doesn’t make much sense to me. In one direction, we have force applied to the shoulder from the back of the device compressing against shims, and in the other direction, we have threads inside the device pulling forward on the muzzle thread peaks.
I like a precision-threaded muzzle by an OCD Gen X gunsmith/machinist with decades behind a lathe, or an older semi-autistic millennial who was trained by an OCD Boomer or Gen X machinist on how to do thread jobs.
For cyclic rate, I use a combo of metering the gas, with the extra power spring providing more return-to-battery energy for positive feeding and bolt closure. Buffer weights are really meant for countering carrier-bounce on different barrel weights on select-fire guns.
Proper or extra power action springs help ensure the bolt always goes into battery when running suppressed too, due to changes in coefficient of friction with fouling in the action.
Try it with Black Arc NAS3 69gr TMK. Should do between 2719-2818fps from 11.5"
Black Arc 62gr TTSX would be a good barrier-blind round too. That should do between 2837-2936fps from 11.5"
What can are you putting on it?
Ok, yes. That's what I do and use heavy springs for.
As for muzzle devices, I do a little trick that I've gotten a feel for that results in about 20 ft-lbs, pretty consistently. When Im being anal, I'll put the torque wrench on it.
I've heard of Black Arc ammo. Their 77s scream out of the barrel, from what Ive seen in the videos by xring. Gotta get me some of that. It shot pretty good too.
Man... I've been feeling pretty rotten about a muzzle device I put on a little while back... I would almost hate to even admit to the community what I did... But I got into a frenzy... And I wasn't listening to reason within myself... I previously struggled with this muzzle device... And no matter what combination I tried I couldn't get it right... Well I finally found a decent combination, but after I put rocksett on it, I couldn't get the same time out of it, so I up'd the torque by 1 lb until I did... By the numbers, it is over torqued... I haven't had a chance to have it out yet to see if it's actually had an effect... But I'm not feeling that great about it...
I did put a jag down the barrel with a heavy patch... I couldn't feel any constriction .. but would you really feel that? I don't know...
The device is a 5/8-24 Rearden R2S/ ht, on a KAK 'mr. Blonde' 9" 300 blk (stainless) with Griffin shims.
I reside in Idaho and have regular flocks of Seagulls as well as Pelicans set down at the two rivers convergence . Have damn near every winged creature zip by or lite here . Raptors species well into double digits up the wazoo ,water fowl too many to even name and also Sand Hill Cranes ( Prime Rib of the air waves ) . Great Salt Basin runs through Nevada ,Utah and Idaho ,the old boy isn't shooting chickens
Headshot a pdog today at 143 yards with Armalite barrel carbine. Has a 2-7x Nikon on it and seems to shoot everything from 40gr to 77gr into about 1.5" at 100 right now and cycles everything I have tried in it. I'm pretty sure my optic and myself are the limiting factor on this thing. I'll keep 52gr match hollow points handy with it for now.
