Features:Late 80's 723 style carbine. Lightweight K.I.S.S. and old school cool. Use as a base for your clone builds or simply run it as is. H&R marked M16A2 lower with an H&R M16A1 upper matches the transitional period after the M16A1 based carbines and before the adoption of the M4.Details: Caliber: 5.56 NATO Barrel Length: 14.7" P/W to 16" OAL Barrel Profile: Pencil Barrel Steel: 4150 Chrome Moly Vanadium Barrel Finish: Parkerized Chrome Lining: Yes Muzzle Thread Pattern: 1/2" x 28 Twist Rate: 1 in 7" Barrel Extension: M4 Gas System Length: Carbine Diameter at Gas Block: .625" Gas Block Type: Rifle Height Front Sight Base Muzzle Device: A2 -style Receiver Material: Forged 7075-T6 Lower Receiver Type: M16A2 Upper Receiver Type: M16A1 w/o feed ramps Handguard Type: Carbine 7 hole with heat shields Bolt Material: Carpenter 158 Steel Bolt Carrier Profile: Full Auto Fire Control Group: Standard Mil-Spec Trigger Group Grip: A2-style Stock: CAR-style Buffer Tube Length: Carbine 6 Position Buffer Tube Diameter: Mil-spec Overall Length: 32 inches Weight (as configured): 6 lbs