Knights armament SR-16 with upgrades -Added 10.3"/10.5" Outer Barrel -Added BTC or GATE MosFET -Added SHS 13:1 Gear Set -Added SHS Piston -Added SHS High Torque Motor -Added Rhop/Lapped Barrel Build Lightly used, run at 350fps w/.2g HPA BB's and with 11.1 Lipos.