The 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 removable barrel insert provides a custom fit for both standard tapered barrels and .920" bull barrels. Patented Stowaway 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. The pistol grip is designed to fit the spring-loaded Tac-Hammer Monopod for increased stability (sold separately).