YHM is very pleased to offer this fully customized AR-15 top end assembly.Features Include:* Mil. Spec. Forged 7075-T6 Aluminum YHM Flat Top Upper Receiver* "T" Marked Upper Receiver* Forward Assist* Mil. Spec. Bolt Carrier Assembly* 16" 4140 Steel Barrel, Heat Treated to RC 25-32* Chambered in 5.56 N.A.T.O., Chrome-Lined with either a 1:9" or 1:7" Twist* YHM Diamond Fluting Improves Rigidity and Aids in Barrel Cooling* YHM Phantom 5C2 Flash Hider / Compensator (YHM-28-5C2)* YHM Carbine Length Smooth Handguard (YHM-5000)* YHM Front Flip Sight Tower (YHM-9394)* YHM Flip Rear Sight (YHM-9680)Total Weight: 4.5 Pounds