Hk 416 Internals Btc Chimera Mk2 perfectly shimmed shs 13:1 gears krytac bucking flat hopped vfc barrel vfc rotary hop up shs pommy piston head shs piston with metal reinforced teeth shs high torque motor vfc gearbox shell shs tappet plate very snappy trigger response , 25-30 rps with 11.1 lipo (low use of parts) externals red dot with magnifier front foregrip silencer battery pouch on stock for easier battery storage range- 150 200 ft fps-330-350 ft NO TRADES - please feel free to ask any questions