Accuracy question

Discussion in 'Silencers' started by mgpatty, Apr 30, 2012.

  1. mgpatty New Member

    I have a BA30 that I am using on my AI AE with a 20" barrel. With the suppressor attached, it is shooting .5 mil high at 100 yards. It is repeatable, and tightens the groups, so I'm happy the performance. However, I've never had a suppressor that causes the groupings to rise. All others have caused a downward shift. What could be causing it to rise so drastically? Barral harmonics?

    Thanks!
  2. Zak Smith Operations

    • Instructor
    The vast majority of rifles have a downward shift.

    A very few number have an upward shift. If there are no issues with the muzzle threads or shoulder, then it is due to the barrel harmonics.

    If you look through the action with the bolt removed (ie looking into the action and out of the muzzle), there should either no be "shadow" of the suppressor or it should be exactly concentric with the bore. If you see an lopsided shadow from the suppressor (its exit aperture), that means something with the muzzle threads are not exactly true/square.

    hope this helps
    Zak

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