This upper comes equipped with a 16" M4 Contour Barrel machined from 4140 Chrome Moly Steel, a true 5.56x45mm NATO chamber for use with either commercial or higher pressure military surplus ammunition, and a versatile 1 in 9" Rifling Twist that is capable of stabilizing light- to medium-weight bullets of up to about 69 grains. Additional features include a Carbine-Length gas system, forged A2 Front Sight Assembly with bayonet lug, 2-Piece Glacierguard Handguards, complete bolt carrier group, charging handle, forward assist, shell deflector, ejection port door and A2 Flash Hider.
- Upper Receiver: A3 Flat-Top
- Barrel Length: 16"
- Barrel Contour: M4
- Barrel Material: 4140 Chrome Moly Steel
- Muzzle Thread Pattern: 1/2"-28
- Chrome Lined: No
- Barrel Finish: Parkerized
- Twist Rate: 1 in 9"
- Chamber: 5.56x45mm NATO
- M4 Feed Ramps: Yes
- Muzzle Device: A2 Flash Hider
- Gas System Length: Carbine
- Gas Block Diameter: 0.750"
- Handguard: 2-Piece Polymer Glaciergaurd
- Sights: A2 Fixed Front, No Rear
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: Commercial
Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.