•HBRS Combo - Harris Engineering •HBRS bipod with RBA-1 (RotaPod) and "S" lock Combo for Picatinny rails •HBRS extends from 15cm - 23cm Swivels (tilts) • The RBA-1 (RotaPod) is a quick detach adapter that rotates (left-right) for Picatinny rails •The "S" lock replaces the knurled knob with a lever for more torque so you can lock the swivel •All three units Factory assembled ready to mount on your Picatinny rails