Product Description The FightLite DFX (Dual-Feed Conversion) is a revolutionary, patent-pending drop-on upper receiver group engineered to fit all MIL-Spec AR15/M16 or M4 pattern lower receivers with zero permanent modification required. Chambered in 223 Remington/5.56 NATO and featuring a heavy-duty, free-floating 16.25" fixed barrel, the DFX delivers reliable belt-fed performance by accepting M27 linked ammunition, 100/200 round SAW drums, and standard STANAG pattern AR15/M16 box magazines. Its patented Dual-Feed capability allows seamless, on-demand transitions between belt-fed and magazine-fed operation at user discretion, making it one of the most versatile upper receiver systems available for the AR platform. The gas-piston and pusher-rod system ensures consistent, reliable cycling across a wide range of conditions, while the slimline free-floating Picatinny rail handguard provides ample mounting real estate and a slim profile. Finished in black and includes 100 M27 links. Product Highlights Patent-pending Dual-Feed capability accepts M27 belt-fed links, STANAG pattern box magazines, and 100/200 round SAW drums for unmatched operational versatility Gas-piston and pusher-rod operation with closed bolt design ensures reliable, consistent cycling in all environments Heavy-duty, free-floating 16.25" fixed barrel chambered in 223 Remington/5.56 NATO for accuracy and durability Free-floating slimline Picatinny rail handguard provides a lightweight profile with full accessory mounting capability True drop-on fit for all MIL-Spec AR15/M16/M4 lower receivers with no permanent modification required Specs Brand: FightLite Model: DFX (Dual-Feed Conversion) Caliber: 223 Remington / 5.56 NATO Barrel Length: 16.25" Color: Black Feed System: Dual-Feed -- Belt-Fed M27 Links, STANAG Pattern Box Magazines, 100/200 Round SAW Drums Operation: Gas-Piston & Pusher-Rod System Bolt Type: Closed Bolt Handguard: Free-Floating Slimline Picatinny Rail Compatible Lower Receivers: All MIL-Spec AR15/M16/M4 Pattern Includes: 100 M27 Links MPN: DFX-001 UPC: 850017078697 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.