SBA4 BLK, 5-POSITION ADJUSTABLEDesigned after the SBM4 5 position adjustable Integral, ambidextrous QD sling socket US veteran designed and proudly made in the USA 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).