The Adaptive Tactical Tac-Hammer RM4 Stock is the most advanced and versatile stock available for the extremely popular Ruger 10/22 rifle. This innovative stock is loaded with more features than any other on the market.The pistol grip is designed to fit the spring-loaded TacTRED(TM) monopod for increased stability (sold separately). TacTRED provides a quick” stable” single point rest on any surface and ensures maximum tripod-like stability when used with a front rail-mounted bipod or front rest.The removable barrel insert provides a custom fit for both standard tapered barrels and .920″ bull barrels. Patented Stowaway(TM) accessory rail is concealed in the forend. When reversed” the rail is available for a bi-pod or other accessories. Get custom length-of-pull for proper fit and improved performance with the adjustable M4 type butt-stock” equipped with ambidextrous storage compartments for two spare Ruger rotary magazines.