Barrel:

• 16″ MODIFIED HBAR CONTOUR 450 BUSHMASTER BARREL
• Caliber: 450 Bushmaster
• Length: 16″
• Gas Block: .875
• Material: 4150 CMVS Steel
• Gas System: Carbine Length
• Twist Rate: 1:24 Twist
• Finish: Black Nitride
• Thread: 5/8×32

Handguard:

Easy to install. 20 alignment holes on barrel nut for precise and secure fit
• Non slip holding surface – knurled finish
• Fits .223 – barrel nut and tools included.  ID  1.75″

Upper Receiver:

• Forged 7075-T6 Mil-spec receiver for a standard AR-15 rifle
• Picatinny rail, t-marks, and M4 Feed Ramps

Muzzle Brake:

• .450 Bushmaster or Bull barrel
• Black Phosphate
• 11/16″x24

Dust Cover Door:

Includes:

• Dust cover door
• Spring
• Rod

Charging Handle:

• AR-15 Dual Ambidextrous Charging Handle
• 7075 T6 Aluminum
• Type 3 Hard Coat Anodized Finish

Gas Block:

Includes roll pin, screws & hex wrench.  Made from high quality steel.  Mounts via bottom set screws.

Color:  Black.  For 0.875″ barrels, most commonly used on AR-15 223/5.56 Bull Barrels.

Gas Tube:

• Stainless Steel Construction
• Comes with Roll Pin

BCG:

• Brand – Bear Creek Arsenal
• Caliber – .450 / .458
• Carrier Style – Standard
• Platform – AR-15
• Bolt Finish – Parkerized
• Bolt Material – 9310 Steel
• Carrier Finish – Black Nitride
• Gas Key – Staked
• Weight – 0.71 lb