The dedicated wrench features four precision-machined teeth that ensure complete, non-slip engagement with all four notches of an M4-type receiver extension nut, facilitating the easy removal and installation of collapsible carbine buttstocks. It effectively transfers all torqueing force to the nut, enabling quick tightening or removal without risking damage to the nut, extension tube or receiver due to wrench slippage. This tool includes additional features from our universal M4 buttstock tool - a pry blade/screwdriver, a 1/2 inches square torque drive opening, a fixed stock receiver extension remover and a convenient hole in the handle for pegboard hanging. Constructed from heavy-duty steel, it is machined from a single piece of 0.312 inches thick steel and finished with a durable black oxide coating.

The wrench features four precision-engineered teeth designed for optimal engagement with M4-type receiver extension nuts, guaranteeing a non-slip, secure operation
The design facilitates the efficient transfer of torque, enabling rapid tightening or removal without causing damage to the nut, extension tube or receiver
Fabricated from heavy-duty steel with a black oxide finish, it incorporates additional features such as a pry blade/screwdriver and a 1/2 inches square torque drive opening

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