Smashing BBs?

Discussion in 'Gun Building, Modifications & Repairs' started by TeamESADS, Sep 30, 2012.

  1. TeamESADS

    TeamESADS New Member

    293
    0
    Rancho cucamonga
    I have a King arms GBB M4 and today for some strange reason it started smashing BBs at the front of the bolt. The bolt never goes forward all the way and the top BB in the mag ends up cracked. I can't figure out the problem. any ideas?