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

Direct replacement for worn or damaged triggers

We sell Smith and Wesson pistol and revolver used

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 .