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Posted: 6/3/2010 6:24:23 PM EDT
I have a DPMS lower with Bushmaster Competition trigger  set.
Spike Tactical M4 22 upper.

I have fired about 1,000 round since new.

Trigger pull deteriated and I pulled the hammer to clean the gun when I found the hammer pin broken at the J notch.
Any ideas why or how to prevent.

The break edges look almost like the pin was cast.
Link Posted: 6/3/2010 6:46:49 PM EDT
Stop shooting 22's
Buy lots of pins.  In your case you have a base line.  Replace the pin at a % rate you feel works. Go to next larger pin as the lower gets hammered.
This has been covered in depth on Several recent Post's
Link Posted: 6/3/2010 7:03:39 PM EDT
This is very common.
Link Posted: 6/4/2010 6:07:11 PM EDT
I did a search on this topic before posting this question,  and did not get anything on it.

Would anti rotation pins work better with the .22 upper?
Link Posted: 6/5/2010 12:26:20 AM EDT
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