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Thread: A muzzle device, and its affect on the mechanical accuracy of a barrel

  1. #11
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    Not much that I could tell at 50 yds. I haven't had a chance to shoot it at 100 yet.

  2. #12
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    My major first hand experience with a difference in muzzle devices was between a standard A2 and FSC556.

    First started with a BCM middy, 12" lite rail, used an Aimpoint to zero with AP and A2 zeroed at 100 and remember having about 2" group, average.

    Talked into a FSC556, put it on and I was 5" off at 25! low and right. I zeroed it and later got a Nightforce 1-4 w/CQB reticle. I could not do better than a fat 3" at 100

    I put the A2 back on and zeroed at 100 with the scope--moa

    All three times muzzle devices installed with crush washers, new ones. All ammo was 55 grain ball.

    That's my experience with impact shifts and accuracy changes. Nothing scientific, for or against a product, etc
    Last edited by mark5pt56; 04-06-10 at 18:32.
    GET IN YOUR BUBBLE!

  3. #13
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    Quote Originally Posted by RetreatHell View Post
    Damn... never even knew that was possible, man. Do you basically tighten the muzzle device down first, then pull the barrel out of the upper, turn it until the muzzle device is properly aligned, and then put it back together again?
    Pretty sure he means "turned" as in on a lathe. A properly-equipped machinist can remove material from the barrel, in effect lengthening the distance from the barrel shoulder to the threads in such a way that when the muzzle device butts up against the shoulder, it will be indexed in the correct position.

  4. #14
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    Quote Originally Posted by RetreatHell View Post
    Damn... never even knew that was possible, man. Do you basically tighten the muzzle device down first, then pull the barrel out of the upper, turn it until the muzzle device is properly aligned, and then put it back together again?
    The front edge of the barrel is shortenend a tiny bit to allow the muzzle device to line up correctly with no washers (crush or peel). My Benny Hill Rolling Thunder is that way.

    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  5. #15
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    Quote Originally Posted by gotm4 View Post
    The front edge of the barrel is shortenend a tiny bit to allow the muzzle device to line up correctly with no washers (crush or peel). My Benny Hill Rolling Thunder is that way.

    Well shit... I feel like a douche-bag now Although as I read crazymoose's comment above, I instantly remembered reading in my surefire suppressor attachment instructions that the "optional" method for gunsmiths is to do just that. I just completely forgot about it... even though it was only 2 weeks ago.

    Thanks for the clarification though, guys!

    Semper Fi,

    -Paul

  6. #16
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    Quote Originally Posted by RetreatHell View Post
    Well shit... I feel like a douche-bag now Although as I read crazymoose's comment above, I instantly remembered reading in my surefire suppressor attachment instructions that the "optional" method for gunsmiths is to do just that. I just completely forgot about it... even though it was only 2 weeks ago.

    Thanks for the clarification though, guys!

    Semper Fi,

    -Paul
    Funny, I installed one of those about a month ago, that's how I learned about it. After dicking around with those shims for over half an hour trying to get the torque just right, only to find that applying Rocksett seemed to alter the timing when it had been lined up perfectly, I think the machining method might actually be easier to someone with the skill and tools.

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