FightLite Industries DFX Complete Upper Features The FightLite DFX is a revolutionary patent pending Dual-Feed Conversion upper that readily fits mil-spec AR-15 M16 and M4 pattern lower receivers without permanent modification. Its gas piston and pusher rod operating system runs on a closed bolt contributing to reliable cycling across a 12.5 inch heavy duty free-floating fixed barrel system chambered in 5.56 NATO and .223 Remington. A free-floating slimline Picatinny rail handguard surrounds the barrel giving shooters a stable continuous mounting surface for optics lights and other accessories. Because the upper simply drops onto an existing lower shooters can add genuine belt fed capability to a rifle they already own. The DFX s signature feature is its dual-feed capability letting the rifle feed from belt-fed M27 linked ammunition while retaining the ability to seamlessly transition to standard STANAG pattern box magazines at the user s discretion. This flexibility means shooters are never locked into one feeding method and can switch depending on the mission or range session. The included 100 M27 links give shooters immediate belt fed capability right out of the box. Finished in black for a tough no frills exterior the FightLite DFX brings genuine squad automatic weapon style firepower to an AR-15 platform available for sale at GrabAGun. FightLite Industries DFX Complete Upper Specifications Manufacturer: FightLite Industries Model: DFX Type: Upper Caliber: 5.56 / .223 Rem Barrel Length: 12.5 Operating System: Gas Piston and Pusher Rod Action: Closed Bolt Color: Black Compatible Hosts: AR-15 / M16 / M4 Lower Receivers Feed System: M27 Links or STANAG Magazines Includes: 100 M27 Links Available At: GrabAGun