Mine is a small hole on the frame next to the rear sight. The firearm came with two small black keys (Which look like small handcuff keys) which can be inserted into the hole and turned to actuate the firing pin lock
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Smith & Wesson M&P .40 Full Size w/ Streamlight TLR-3
SIG Sauer SP2022 w/ Streamlight TLR-3 & Steel Guide Rod
Beretta U22 Neos 6" Barrel w/ Pride Fowler SOPS-33m Red Dot
AR-15 Budget Build - Palmetto State Armory Lower, DPMS Upper, Magpul MOE Furniture
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