Brownells M4 Buttstock Wrench for CAR-15/M4

The Brownells M4 Buttstock Wrench is a dedicated gunsmithing tool designed for installing and removing the buttstock on CAR-15 and M4-style rifles. Built to fit the specific geometry of the M4 collapsible stock castle nut and receiver extension, it helps prevent damage to the finish and components during assembly or disassembly. A practical, firearm-specific tool for armorers and gunsmiths working on AR-15/M4 platform rifles.