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Re: AR rifles, the last round, bolt lock back POI shift
[Re: ChadTRG42]
#8012684
10/16/20 06:24 PM
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Joined: Jul 2012
Posts: 15,605
603Country
THF Celebrity
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THF Celebrity
Joined: Jul 2012
Posts: 15,605 |
I finally quit fighting my AR and had it rebarreled. I was never going to get that original barrel to shoot worth a darn. Shoots great now. I still keep the action wet, to a degree anyway.
Not my monkeys, not my circus...
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Re: AR rifles, the last round, bolt lock back POI shift
[Re: Wilson Combat]
#8012688
10/16/20 06:27 PM
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Joined: Mar 2012
Posts: 13,591
1860.colt
emoji colt.45
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emoji colt.45
Joined: Mar 2012
Posts: 13,591 |
Obviously not saying this isn't a real problem, but I've personally never seen this issue or at least didn't notice it. I do tons of accuracy testing for our barrel production and initial load development for our ammo company and always shoot the gun to bolt stop when shooting groups. But as we all know there are LOTS of variables when trying to shoot good groups.
Also when shooting groups and working up a gas port size at the same time I've never noticed the last shot when the bolt didn't stay to the rear and smacked closed on an empty chamber effecting the group either. Bill, you might have missed it in the other discussion, but Chad did say that this phenomenon typically does not occur or is not prevalent in the higher end rifles. Maybe you just shoot high quality rifles? Guilty as charged Have some experience with M-60... Agree with the statement in blue... Biggest variable over looked with, True gun control tis the jerk behind the trigger... One of the Notsee grammer police will be along shortly ta explain... on the groups Chad... @ what range, (distance), might have over looked it... This poster will self destruct in 5sec...
i'm postaddic
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Re: AR rifles, the last round, bolt lock back POI shift
[Re: 603Country]
#8012987
10/16/20 11:32 PM
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Joined: Oct 2012
Posts: 29,576
Sneaky
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THF Celebrity
Joined: Oct 2012
Posts: 29,576 |
I finally quit fighting my AR and had it rebarreled. I was never going to get that original barrel to shoot worth a darn. Shoots great now. I still keep the action wet, to a degree anyway. I keep the action wet, too. It’s for the best.
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Re: AR rifles, the last round, bolt lock back POI shift
[Re: ChadTRG42]
#8013534
10/17/20 03:48 PM
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Joined: Sep 2011
Posts: 3,031
Vern1
Veteran Tracker
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Veteran Tracker
Joined: Sep 2011
Posts: 3,031 |
With equal lube, ammo and maintenance, you can somewhat predict effect of the last bolt hold open based on rifle configuration. A light weight carbine will tend to string the last shot more than a heavy rifle with long bull barrel, rifle length gas tube, rifle buffer and FA bolt. It's not as pronounced shooting off of a bench where you are holding the rifle for accuracy and have it anchored better.
Try it with a 9mm or 45 pistol at 20 yards.
Cheers, Vern1 Texans since The Old 300 in 1824 NRA Lifetime Member
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Re: AR rifles, the last round, bolt lock back POI shift
[Re: ChadTRG42]
#8025821
10/27/20 04:48 PM
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Joined: Nov 2005
Posts: 32,601
sig226fan (Rguns.com)
duck & cover
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duck & cover
Joined: Nov 2005
Posts: 32,601 |
This issue has been discussed for years. I am a fan of Remington semi autos (oddly enough). I still hunt a lot with a Model 750 Carbine, also have a 742 1st year production carbine, and have dealt with a ton of 742's and 7400's over the years. This is an ongoing debate about those folks too, and I think it is worse in those that in AR's....
I think it is worse as it is a solid stop, not incorporating the recoil buffer tube prior to locking up.
It also doesn't occur in HK 91/93/94/PSG series guns..... because they do not lock open, by design and choice.
I think it's a slightly different lock up position, and no drag on the underside of the bolt,....
It also is the same effect whether they are shot from a bench, sand bags, Stewart Sight Vise, or LeadSled....
I personally don't think it can be the stop mechanisms, but Like many of you, I have given up worrying about it.
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