The Colt Conversion Kit contains the complete upper receiver group, including a charging handle, bolt carrier group, and back up sight. Its barrel features a 1/7 right hand twist. Now you can convert any Colt rifle to the most state of the art configurations.
Geissele AR-15 Super 42 Buffer Spring/Buffer Combo For Carbine Receiver Extensions H1 Buffer Weight
Original price was: $75.00.$74.79Current price is: $74.79. 
DNZ Game Reaper-2 Low Scope Mount and Ring Combo 1" Tube 0.98" To Receiver - 701TL2
Original price was: $68.99.$61.99Current price is: $61.99. 
Colt 5.56 14.5″ Barrel Upper Receiver Assembly – LE6921CK
Original price was: $1,036.99.$933.99Current price is: $933.99.
