Quote:
Originally Posted by N_Force
Based on the two pics shows, seems causing by the loosen screw that holding the bolt head.
How many rounds you put through it on that game day? When was your last service it? You know gbb needs to be maintained, especially for those screwed parts after heavily shootimg, need to thead lock them.
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Thanks for the reply.
Last service was January 3, hadn't been used since then. During the service I did notice that the retaining screw had loosened up allowing the bolt head to pivot. Lock tight + tightening the screw fixed this, but it had no visible signs of wear at the time - perhaps the damage was already done. I do a general cleaning & service after each usage, before taking it out to shoot again.
Rounds through it on game day... about 650. This was the most I had used the GBB in one day. Total rounds though it, about 3000.
After posting I fully disassembled and cleaned everything. I think your diagnosis is correct as the bolt carrier has been chewed up a bit where the bolt head locks into it, nothing major just abnormal wear/paint missing where the bolt head is seated. To clarify, this is the stock VFC Bolt Head, not a replacement steel one.