Wilson Combat Bullet Proof Slide Stop, Drop In 45ACP, Blue Finish 414B The slide stop takes an unbelievable pounding in a 1911 Auto making it vulnerable to breakage & wear. Bullet Proof Slide Stops are fully machined from solid bar stock with extra metal left in critical areas for added durability. Bullet Proof Slide Stops have a built in detent" serrated top and maximum tolerance shaft.