This Lewis Machine & Tool SOPMOD buttstock has an improved cheek weld for better shooting position, a watertight battery storage compartment, as well as a padded buttplate that reduces felt recoil and provides no-slip surface against web gear and body armor. LMT is the sole provider of the SOPMOD Buttstock to the US Special Ops Command, US Army, US Navy, US Air Force, US Marine Corps and other government agencies and bureaus. Includes stock with mil-spec receiver extension, receiver extension lock plate and lock plate castle nut. When ordering, specify: Black or Dark Earth.