Product Description The DPMS Panther Arms Bolt Carrier Group (BCG) is a precision-built, mil-spec component designed for AR-15 style rifles chambered in 5.56 NATO and 300 Blackout. The bolt is manufactured from Mil-spec Carpenter 158 steel and has been shot peened, high pressure tested, and Mag Particle Inspected to ensure strength and long-term reliability under demanding conditions. The gas key is machined from solid bar stock, chrome lined, phosphate coated, and secured with grade 8 fasteners staked per mil-spec standards. The bolt carrier itself features a phosphate-coated exterior for corrosion resistance paired with a chrome-lined interior for smooth, consistent cycling. Note: This BCG is packed dry for shipping and may have a grey, dusty appearance upon receipt. This appearance will turn black with the application of CLP or your preferred lubricant. Product Highlights Bolt crafted from Mil-spec Carpenter 158 steel, shot peened, high pressure tested, and Mag Particle Inspected for maximum durability and reliability Gas key machined from bar stock, chrome lined, phosphate coated, and secured with grade 8 fasteners staked per mil-spec Bolt carrier features a phosphate-coated exterior for corrosion resistance and a chrome-lined interior for smooth operation Compatible with both 5.56 NATO and 300 Blackout chambered AR-15 style rifles, offering versatile functionality Packed dry for shipping; grey appearance will turn black upon application of CLP or preferred lubricant Specs Brand: DPMS Panther Arms Manufacturer Part Number: DP51655109766 UPC: 850032424073 Caliber Compatibility: 5.56 NATO / 300 Blackout Material: Steel (Carpenter 158 for bolt) Finish: Phosphate (exterior), Chrome-lined (interior and gas key) Weight: 0.84 lbs Dimensions: 9.9 x 1.7 x 1.6 in Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>