About this BCG: This Bear Creek BC-15 7.62x39/12.7x42/9x39 BCG is made from 9310 steel with a parkerized finish to keep it sleek and strong. It has been MPI tested to ensure it has a tough, durable design. It is compatible with all rear charging 7.62x39/12.7x42 uppers. Features like staking the gas key from the side and the enhanced extractor help elevate this BCG’s durability.
Caliber Compatibility: This BCG is designed for 7.62x39/12.7x42/9x39.
Finish: Nitride - Nitriding is a process during manufacturing that diffuses nitrogen into the steel to make a case-hardened surface for improved resistance and strength. A Nitrided BCG typically has a gloss-black texture. Nitrided Bolt Carriers have increased resistance to heat, and corrosion.
Material: 9310 Alloy Steel - Bolt Head - 9310 Steel is a low alloy steel that is a mixture of nickel, chromium, and molybdenum. This steel is built to have high core hardness and high fatigue strength which make it the perfect steel to hold up in the harsh environments of the bolt head. 8620 Alloy Steel - Body - 8620 Steel is a carburized alloy steel meaning carbon was added to increase the hardness of the steel. 8620 is known for its high case toughness and high core toughness. Made mostly of nickel concentrate, this steel can easily withstand the firing stress of the BCG under operation.
Forward Assist Notches: This BCG comes with forward assist notches which allow the forward assist on the upper to contact the BCG pushing it forward and locking the bolt into place. These forward assist notches can also speedily help clear malfunctions when the BCG becomes jammed.
Gas System: Direct Impingement - Direct impingement is the process of directing the gas created during the operation of a firearm through the barrel, gas block, gas tube, and eventually into the BCG again to cycle the action and prepare the firearm for another round.
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