The TacFire MAR145 BCG Gas Key for 5.56x45mm NATO is a mil-spec replacement carrier key engineered for AR-15 bolt carrier groups. Built from durable steel with a corrosion-resistant phosphate coating, it is designed to maintain proper gas flow and reliable cycling in direct impingement 5.56 NATO rifles.

This gas key is ideal for builders, armorers, and shooters who need a dependable replacement part to keep their rifle running smoothly at the range or during training. Properly staked screws help minimize gas leakage and support long-term durability, making it a practical upgrade for maintaining consistent performance. TacFire’s focus on precision machining and fit delivers a component that reflects the brand’s reputation for reliable, purpose-built firearm parts.

Key Features:

• Manufacturer: TacFire
• Model: MAR145 BCG Gas Key
• Caliber: 5.56x45mm NATO
• Property: Gas Key
• Construction Material: Steel
• Coating: Phosphate
• Mil-Spec Compliant: Yes