Adams Arms' proprietary gas-piston operating systems mechanically actuate the bolt carrier external of the receiver. P1 model features ergonomic mid-length handguards, standard Picatinny adjustable block piston system, tactical stock and grip with QD mounts, enhanced triggerguard. Barrel lengths and chamberings: 16 in. (5.56). P2 model includes ergonomic free float rail, P-Series Micro Block piston system. P2 barrel lengths and chamberings: 16 in. (5.56); 16 in. (300 BLK). P3 line features Proof Research carbon-fiber-wrapped barrel, jet comp, ergonomic free float rail, and P-Series Micro Block piston system. Other features include CMC Flat Bow trigger, a rubber ergonomic grip, adjustable stock with cheek riser. P3 barrel lengths and chamberings: 16 in. (.223 Wylde), 20 in. (.224 Valkyrie).

Ergonomic free float rail. 7.5, 11.5, and 16-in. barrels in 5.56; 8 and 16 in. in .300 BLK; 12.5 and 16 in. in .308., and 18 in. in 6.5 Creedmoor.

Proof Research carbon-fiber-wrapped barrel, jet comp, free float rail. 16-in. barrel in .223 Wylde, 12.5 in. in .300 BLK, 20 in. in .224 Valkyrie, 17 in. in .308., and 24 in. in 6.5 Creedmoor.