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Old March 26, 2020, 03:12 PM   #14
9x19
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Join Date: October 15, 1998
Location: Sherman, TX USA
Posts: 3,750
Here are some pictures to illustrate how the hammer pin in a standard AR fire control group is retained.

Hammer with spring and pin installed - note the boss and coil over on each side extends all the way to the receiver walls (the pin ends will be inside the receiver walls):


Piano wire hammer pin retainer shown at bottom of hammer


Piano wire hammer pin retainer (Shown inside cut in center of pin tunnel) - wire bears against center grooove of hammer pin and keeps pin in place in receiver


I hope this helps...
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