Engineered for consistent function across varied conditions, the FailZero FZ M16/M4 BCG NO HAMMER BLK NIT promotes reliable operation.\n\nHigh quality components and precise manufacturing make FailZero parts ideal for maintaining and upgrading firearms. The durability, reliability, and excellent build quality of these parts will ensure years of service you can count on.\n\n- Manufacturer: FailZero\n- Model: FZ M16/M4 BCG NO HAMMER BLK NIT\n- Product Type: Bolt Carrier Group\n- Material: Black Nitride Coated\n- Unique Features: No Hammer Included, Full Auto Rated, Drop In Component\n- What's In The Box: Bolt Carrier Group