Product Description The Rosco Manufacturing Bloodline Sauce Pack is a purpose-built bundle created to give builders the key components needed for a reliable carbine or pistol setup at a combined value. Each kit is curated to work in sync for consistent gas flow, smooth cycling, and dependable performance right out of the box. This pack includes a Bloodline series 5.56x45mm barrel, a matching Bloodline bolt carrier group (BCG), a non-adjustable gas block, and a gas tube, all finished in a durable black nitride treatment for corrosion resistance and easy maintenance. Product Highlights Complete AR build bundle with matched components designed to function together as a unified system Includes Bloodline barrel, bolt carrier group (BCG), non-adjustable gas block, and gas tube 5.56x45mm / 5.56 NATO chambering for broad ammunition compatibility Black nitride finish for enhanced wear resistance and corrosion protection 4150 chrome moly vanadium (CMV) barrel steel with 1:7 twist (as marked on barrel) Specs Brand: Rosco Manufacturing Manufacturer Part Number: SP-BL-145-556-BCG-GTM UPC: 181969500746 Caliber: 5.56x45mm / 5.56 NATO Finish/Color: Black (Black Nitride) Materials: Chrome moly steel; black nitride treated (per listing data) Barrel Marking: 5.56 NATO, 1:7 twist, 4150 CMV Included Components: Barrel, bolt carrier group (BCG), non-adjustable gas block, gas tube Package Weight: 26.34 oz (per listing data) 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.