Product Description The FightLite RAPTOR Dual-Feed Belt-Fed Complete Upper Receiver Assembly is a revolutionary drop-on upgrade engineered to interchange with standard AR/M4 type uppers and fit any MIL-Spec lower receiver without permanent modification. Rearward compatible with AR15/M16 models produced as early as 1963, the RAPTOR features FightLite&';s patented Dual-Feed technology, allowing the operator to feed from standard AR15/M16 box magazines or M27 linked ammunition seamlessly. Chambered in 5.56x45mm NATO and equipped with a 16.25" self-regulating quick-change barrel, short-stroke gas piston operation, and a lightweight M-LOK aluminum handguard, the RAPTOR delivers superior reliability and adaptability across virtually any mission profile. The precision-machined 7075-T6 billet upper receiver, feed cover, charging handle, and billet steel feed tray are finished in Manganese Phosphate and MIL-A8625F hardcoat anodize for long-lasting durability. Made in the USA, this system is designed for responsible armed citizens, law enforcement, and professional security personnel seeking unprecedented firepower and weapon flexibility. Product Highlights Patented Dual-Feed Technology accepts all AR15/M16 box magazines and M27 linked ammunition for unmatched firepower flexibility 16.25" self-regulating quick-change barrel with 1:7" RHT twist, 1/2"-28 TPI threading, and Black Nitride finish for extreme reliability in adverse conditions Short-Stroke Gas Piston Operation provides consistent, reliable function in harsh environments without the fouling associated with direct impingement Precision-machined 7075-T6 billet upper receiver with integral MIL-STD 1913 optic rail and lightweight M-LOK aluminum handguard with slots at 12, 6, 10, and 2 o&';clock positions True drop-on design compatible with all MIL-Spec AR15/M16/M4 lower receivers requiring no permanent modifications, configurable in seconds without tools Specs Brand: FightLite MPN: RPTR-001 UPC: 850017078666 Caliber: 5.56x45mm NATO Barrel Length: 16.25" Barrel Material: 4150 Chrome Moly Vanadium Steel Barrel Finish: Black Nitride Barrel Twist Rate: 1:7" RHT Thread Pattern: 1/2"-28 TPI Muzzle Device: A2 Flash Hider Upper Receiver Material: 7075-T6 Billet Aluminum Feed Tray Material: Precision Machined Billet Steel Handguard: Lightweight Aluminum with M-LOK slots at 12, 6, 10, and 2 o&';clock positions Finish: Manganese Phosphate and MIL-A8625F Hardcoat Anodize - Black Bolt Carrier Group: MIL-SPEC (included) Charging Handle: MIL-SPEC (included) Optic Rail: Integral MIL-STD 1913 Weight: 6.5 lbs Compatible With: MIL-Spec AR15/M16/M4 Lower Receivers Country of Origin: United States of America Included in Box: Main Action Spring, Bolt Catch, Carbine Stock Spacer, (100) M27 Links, Operator&';s Manual 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.