Improved cheek weld for better shooting position. Watertight battery storage compartments. Padded buttplate reduces felt recoil and provides no-slip surface against web gear and body armor. Updated generation with dual quick detach sling swivel holes. 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. Military version buttstock does not include the sling swivel adapter and is L7LA2B or NSN:1005-01-544-9825 Contact your dealer or LMT directly at 309-732-9527 for estimated delivery time.