Introducing the B5 Systems Enhanced Sopmod Buttstock. Designed to fit a MILSPEC Receiver Extension (Buffer Tube). The NSWC CRANE developed Sopmod Buttstock was born from the unique needs of Special Operation Forces. B5 Systems has taken the venerable design of the Sopmod Buttstock and incorporated the features sought by military professionals and firearm enthusiasts. Building upon its exceptional cheek weld and storage capabilities the B5 Systems Enhanced Sopmod Buttstock features an ambidextrous quick disconnect sling swivel mount, color matching hardware, and construction of milspec materials and finishes. The B5 Systems Enhanced Sopmod Buttstock is available in molded colors of Black and Flat Dark Earth.