S&W M&P 9/40 Sear Housing Block Mag Safety | OEM 421970000 Fire Control Parts 1076) were adopted by the

1076) were adopted by the FBI and other agencies

Inconsistent cylinder timing or alignment with barrel

Genuine S&W Part: Factory original component

We sell Smith and Wesson pistol and revolver used

Direct replacement for worn or damaged triggers

S&W M&P 9/40 Sear Housing Block Mag Safety | OEM 421970000 Fire Control Parts 1076) were adopted by theSmith & Wesson OEM Sear Housing Block Assembly for M&P 9 40 Pistols with Magazine Safety This factory sear housing block assembly with integrated magazine safety is a critical fire control component for M&P9 and M&P40 pistols equipped with magazine disconnect safety. Genuine S&W quality ensures proper fit, reliable function, and safe operation. Genuine S&W Part: Factory OEM component (Part #421970000) Multi Caliber Fit: Compatible with M&P 9mm and .