AM180 Sear Pins



New sear pins to prevent breaking. Instead of the existing spring plunger grooves, which yield a small weak diameter, I make a pins with two "nests".  The spring plunger in the sear rests in one nest or the other.  The plunger slides from one nest to the other by a shallow groove between the nests. The groove helps prevent the plunger from popping out while switching from SEMI to AUTO. The pin material is a heat treated 4140 steel.  



Broken Pins                                                               New Pins


                                                                                    Bottom pin is the old style.

                                                                                    Top two are new style.