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).Length Of Pull: 10.25"-14.75"Grip Type: Black Polymer