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New BCG

Discussion in 'GATE AR-15 Forum' started by nastytrigger, Sep 18, 2010.

  1. nastytrigger

    nastytrigger Mediocre Member

    2,241
    0
    Apr 10, 2005
    Indiana
    I've got a BCM Auto BCG on order for my new NFA-legal LMT 10.5" upper going on my Bushmaster Patrolman lower. Since this upper didn't come with a BCG, what should I check when putting the BCG in? Is it "drop-in" ready?
     
  2. Constructor

    Constructor Moderator

    552
    5
    Dec 10, 2009
    Roaming
    Most are close enough but the headspace should be checked, as an example combining a LMT barrel that was setup for a LMT bolt might be tight when used with a CMT bolt because most CMT bolts have a .153" back of lug to bolt face dim and most LMT bolts have a .148" BOL to BF dim. If the BCM bolts are Microbest bolts like I believe they are it should have a .150 BOL to BF dim which is in the middle of the other 2. Most of the time mix and match works, sometimes it doesn't.
     


  3. nastytrigger

    nastytrigger Mediocre Member

    2,241
    0
    Apr 10, 2005
    Indiana