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How I ruined a good gun--is their hope?

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Unread 03-01-2008, 10:11 PM
Gold Member
Join Date: Sep 2005
Posts: 748
Things to try

Ok the first thing to do is take of the break and shoot it. if the groups are large have a gunsmith look at the crown. When threading the barrel was it recrowned after the machining if not their might be a mark from the live centre that would have been supporting the barrel inside the muzzle. the reason for removing the break is in case it is not perfectly centred and the projectiles are nicking it on exit.

If after removing it it shoots well have a diferent smith check the clearences. if it does not shoot haveva diferent smith check the crown and recrown it then refit the break checking the clearence.

Don't shoot it with the break loose you wil just create an accedent and might wreak the rifle.

The cryo treatment should not make the groups larger this is the first time I've heard that. Did the gunsmith do it himself or was it sent to a specialist cryo company?

Make sure every thing is correctly tensioned and try shooting itbwithout the break as above and it will tell you where to look. if you know a realyngood smith that can lap your barrel try that\as a last resort or even some lapping bullets it is more likley if the barrel was lapped it would have helped the groups more than cryoing tha barrel will ever do.

Cheers Bill
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Unread 03-03-2008, 04:04 PM
Bronze Member
Join Date: Feb 2005
Posts: 83
My pleasure to help Crypto. Some say that reciever play in the AR's does not matter, but I have found this not to be true (it could be how I shoot; I never shoot from a bench, but instead prone with the rifle tensioned between my left hand & right shoulder). I burned a lot of ammo before I figured it out, but my AR10 now holds it's own with my bolt guns.

Have you shot the rifle with the play removed to comfirm the fix yet?

ETA: I would advise staying away from the 4350 & 4831 class of powders (excessive port pressure). The rifle was designed for powders like Varget, Re15, 4895, 4064. My favorite load is 44 grs. of Re15 with a Sierra 175 MK.

Last edited by DougH9; 03-03-2008 at 04:16 PM. Reason: More info.
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Unread 03-03-2008, 06:03 PM
Junior Member
Join Date: Feb 2008
Location: Cedar City, Utah
Posts: 21
Thanks for the tips Bill. However, I am particular about who I take my gun to and I like to keep it local and visit the shop so I can see what kind of operation it is. In this case I had Match Grade Machine in St. George, Utah thread and recrown my barrel. He did an excellent job and building barrels is all they do, though he doesn't normally do ARs.
I have got the gun shooting what it did when it was new, so I am happy. It just took a lot more load development than I had anticipated, and I quickly found myself in a panic.
I think that slop in my upper and lower was playing a part in things too. Which would explain why I and others have experienced a degradation in accuracy after putting a number of rounds through these guns. I am going to try and remove the shims to confirm this as Doug suggested and to resolve an argument with my brother.
One thing to note, once I got it shooting like I wanted a severe wind came up and blew over my chrono and, well, took my gun off the bench where it fell about five feet to concrete (adjacent shooting platform is lower than the one I was on, which is where it landed). I hate the wind and this didn't help. I picked the gun up and it fired it, it was still on zero. I love my valdada scope.
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