M&P 15-22 Failure to fire
Posted: Wed Apr 29, 2015 9:37 pm
The last round in my mags (six OEM 25-rounders) will chamber, but will not fire. The firing pin is not hitting the round though the hammer is released and down. When the charging handle is pulled back, the un-fired round will extract and the bolt will hold back.
Again, after 24 rounds of perfect chambering, firing, extracting and ejecting, something blocks the hammer from contacting the firing pin when the last round is chambered and the mag is empty. This happens with all mags...none of which have worn or deformed follower lugs; all seem to be held firmly and correctly by the mag release mechanism; and, seem to contact the bolt hold-back with no mis-alignment. It seems like it must be in rifle mechanism.
I think I understand the mechanisms and parts involved, but something (obviously) is wrong. Any ideas of what I should look for...or where..I should look?
Again, after 24 rounds of perfect chambering, firing, extracting and ejecting, something blocks the hammer from contacting the firing pin when the last round is chambered and the mag is empty. This happens with all mags...none of which have worn or deformed follower lugs; all seem to be held firmly and correctly by the mag release mechanism; and, seem to contact the bolt hold-back with no mis-alignment. It seems like it must be in rifle mechanism.
I think I understand the mechanisms and parts involved, but something (obviously) is wrong. Any ideas of what I should look for...or where..I should look?