TacFire BCG Gas Key Features The TacFire BCG Gas Key is purpose built to replace a gas key on a 5.56x45mm NATO bolt carrier group restoring proper function to an AR-15 pattern rifle s gas system. The gas key is a small but essential component responsible for directing propellant gas tapped from the barrel into the bolt carrier which in turn cycles the action and ejects the spent case. A worn cracked or improperly staked gas key can cause gas leakage leading to unreliable cycling short stroking or outright failure to cycle so a quality replacement part like this restores dependable function. Finished in Black the key matches the appearance of most factory and aftermarket bolt carrier groups for a clean consistent look once installed. Measuring 3.30 inches in length 2.50 inches in width and 0.40 inches in height the gas key is sized to fit standard AR-15 bolt carrier patterns without modification. At just 0.04 lbs the part itself adds negligible weight to the overall bolt carrier group keeping the reciprocating mass close to factory specifications. Replacing a damaged gas key rather than the entire bolt carrier group is also a more economical repair path for builders and owners performing their own maintenance. The TacFire BCG Gas Key is a practical direct replacement part for sale at GrabAGun suited to any 5.56x45mm NATO AR-15 owner needing to restore proper gas system function. TacFire BCG Gas Key Specifications Manufacturer: TacFire Model: BCG Gas Key Caliber: 5.56x45mm NATO Finish: Black Length: 3.30 Height: 0.40 Width: 2.50 Weight: 0.04 lbs Available At: GrabAGun