Thought I'd update on this.
The fix I performed earlier managed to work for a few weeks and then I noticed the roller pin coming lose again. Tried further deforming the end of the pin with grooves on it in an attempt to get it to stop coming loose still when in place. This lasted another couple games until about 3/4 of the way through the FR Night game on July 3rd where at one point the gun jammed on me. After opening it up noticed the roller pin had once again found it's way down beneath the fire selector.
Fixed the problem this time by removing the trigger assembly and replacing the hammer/roller/roller pin combination with new parts. So far things seem to be solid.
Quote:
Originally Posted by z0ng
Oh glee! After returning from work irate and completely pissed off I managed to fix my gun!
So playing around I realised the gun would no longer go into safe anymore. This let to exploring beneath the safety selector with a flashlight and some toothpicks. I eventually dug out part #52 from way down in there (looks like it wasn't lost after all).
After deforming the end of the pin a little so it stays in the hammer assembly better I reinserted it. Reassembled and gun is shooting just fine again.
I made sure to not sit there and try firing my gun repeatedly while it was in this 'broken' condition. Thereby hopefully avoiding any unnecssary wear on any other parts. Just to play it safe though I ordered some extra internal bits and a replacement set for parts #50, #51 and #52 so when the time comes I can rebuild this thing.
Yay for not being useless! 
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