Designed for all platforms capable of accepting a mil-spec carbine receiver extension, the SBA4 is 5-position adjustable and features an integral, ambidextrous QD sling socket. The SBA4 is compatible with any mil-spec carbine receiver extension (not included). Features: Designed after the SBM4 5-position adjustable Integral, ambidextrous QD sling socket US veteran designed and proudly made in the USA Product includes: Brace Adjustable nylon strap