Smith & Wesson M&P15-22 Bolt Guide Assembly. Produced from quality steel, this bolt guide is manufactured for the Smith & Wesson M&P15-22 blowback-operated rifles chambered in .22 LR. This bolt guide is part of the completed bolt assembly and both connects and retains the bolt stop to the bolt assembly.This part is perfect as a spare on the workbench or as an immediate replacement for a lost or damaged piece.