Mounts to rifle-length extension tube without A2 spacer (not included); Can be adapted for use with Rifles Sloping cheek weld combines a slim profile with user comfort; Overall shape provides for offhand hold options Rubber butt-pad provides positive shoulder purchase to prevent slippage Large storage compartment easily accessible behind hinged butt-plate Knockout bosses on the bottom allow for the addition of an optional accessory rail ASIN#: B00KIYNANC Model number#: MAG404