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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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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...
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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Originally Posted by Wilson Combat
Originally Posted by unclebubba
Originally Posted by Wilson Combat
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? confused2


Guilty as charged flag



peep bang bs rofl
bolt

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...


up on the groups Chad... @ what range, (distance), might have over looked it...

This poster will self destruct in 5sec...
flag



i'm postaddic
Re: AR rifles, the last round, bolt lock back POI shift [Re: 603Country] #8012987 10/16/20 11:32 PM
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Originally Posted by 603Country
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.

Re: AR rifles, the last round, bolt lock back POI shift [Re: ChadTRG42] #8013534 10/17/20 03:48 PM
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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.


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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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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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