B5 Systems SOP1075 Enhanced SOPMOD Flat Dark Earth Synthetic for AR-Platform with Mil-Spec Receiver Extension (Tube Not Included)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. The Enhanced SOPMOD fits all Milspec AR15 receiver extensions.