The PSR (Precision Sniper Rifle) Atlas® Bipod came about as the Atlas® was selected for the USSOCOM Sniper Rifle system. The PSR was in response to the testing feedback that we got from the Military. These changes include non-rotational legs, fore and aft pivot limiting bosses and a 40% stronger Inner leg. All PSR models of Atlas® Bipods listed here are shipped unassembled for coating.