Since 2011, B5 Systems has manufactured the Crane NSWC designed SOPMOD buttstock for the US Department of Defense. B5 is proud to offer the same stock to the public. The SOPMOD features color matched steel hardware, no slip cushioned buttpad, and dual water resistant storage compartments. Product Features Ergonomic Cheek Weld Color Matched Steel Hardware Dual Water Resistant Storage Compartments Fixed Sling Mounts Cushioned Non-slip Buttpad with Built in M4 Multitasker Tool Holder (tool sold separately) Sure Grip Stock Latch Made of MIL-SPEC Materials and Finishes Fits MIL-SPEC Carbine Receiver Extensions Product Specifications Weight: 11.80 oz Length: 7.43 in Width: 2.40 in Height: 4.93 in