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Posted: 10/26/2013 12:34:58 AM EST
I just picked up a mac11 in 9mm from 1987 and i was examining the bolt there seems to be crumbling gunk in the rear where the back of the Firing pin / bar is , is that suppose to be there was it rubber or just really old dirt? i will post a picture later if no one has one to tell me .
Link Posted: 10/26/2013 1:05:27 AM EST
Link Posted: 10/27/2013 7:39:01 AM EST
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Originally Posted By osprey21:
It's what's left of the original recoil buffer as they deteriorate with time and usage. Replace it with one of the urethane buffers - available from several sources.

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This, but to be 100% sure pictures would still be nice
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