The Tac-Hammer RM4 is the most advanced and versatile stock available for the Ruger 10/22 and it's not a close competition. This feature-loaded platform is built around a removable barrel insert that accommodates both standard factory tapered barrels and .920 bull barrels, making it compatible across virtually the entire Ruger 10/22 ecosystem. The Patented Stowaway accessory rail rides concealed inside the forend until you need it reverse it to deploy a bipod, flashlight, or other rail-mounted accessory instantly. Dial in your ideal length-of-pull with the adjustable M4-style buttstock, and take advantage of ambidextrous storage compartments that hold two spare Ruger rotary magazines within arm's reach (magazines not included). The pistol grip is designed to accept the spring-loaded Tac-Hammer Monopod for single-point stability on any surface (sold separately). Black synthetic construction throughout.