The Brownells M4 Buttstock Wrench is a dedicated tool for installing and removing M4-type collapsible carbine buttstocks. Four precision-machined teeth provide non-slip engagement on the receiver extension nut, helping transfer full torquing force without risking damage to the nut, extension tube, or receiver from wrench slip.
Key Features
Four precision-machined teeth for full, non-slip engagement of M4-type receiver extension nuts with four notches
Transfers torquing force directly to the nut for faster tightening or removal
½-inch square torque drive opening for consistent tightening with compatible torque tools
Built-in pry blade/screwdriver utility for common stock/extension adjustments
Fixed stock receiver extension remover feature to help when working on installation/removal tasks
Convenient hanging hole for pegboard storage
Built for repeat work at the bench, this hardened steel wrench makes M4 buttstock service cleaner and faster.
