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. FeaturesErgonomic Cheek WeldColor Matched Steel HardwareDual Water Resistant Storage CompartmentsFixed Sling Mounts Cushioned Non-slip Buttpad with Built in M4 Multitasker(R) Tool Holder (tool sold separately)Sure Grip Stock LatchMade of MIL-SPEC Materials and FinishesFits MIL-SPEC Carbine Receiver ExtensionsLength: 7.43 inWidth: 2.40 inHeight: 4.93 in