Made for the 15-22 Pistol, but can be used on the Rifle as well. Quickly and easily tighten the factory barrel nut with our barrel nut wrench.Remove or replace the handguard on your Smith & Wesson (S&W) M&P15-22 using the S&W M&P15-22 Breech Block Wrench by Tacticool22.This is the original and only one available. CAUTION: Do NOT hold any 15-22 by the upper or lower receiver for doing an