The B5 Systems Enhanced Sopmod Buttstock is designed to fit a MILSPEC Receiver Extension (Buffer Tube).The Enhanced SOPMOD features ergonomic cheek weld, color matched steel hardware, overmolded steel anti-rotational QD sling mounts, fixed sling mounts, no slip cushioned butt pad, suregrip stock latch, and dual storage compartments.The Enhanced SOPMOD is made of Milspec materials and finishes, and is offered in standard B5 Systems color options.