B5 Systems SOPMOD Stock, Mil Spec, Quick Detach Mount, Flat Dark Earth SOP-1075 B5 Systems has taken the venerable design of the Crane NSWC designed SOPMOD buttstock and incorporated the features sought by military professionals and firearm enthuisiasts. The Enhanced SOPMOD features color matched steel hardware" one piece anti-rotation quick disconnect sling mounts" no slip cushioned buttpad" suregrip stock latch" and dual water resistant storage compartments. The Enhanced SOPMOD is made of milspec materials and finishes. Proudly made in the USA.