FightLite Industries DFX Upper Features The FightLite DFX uses a patent-pending dual-feed design that allows the upper to feed from belt-fed M27 linked ammunition while retaining the ability to run standard STANAG pattern box magazines at the shooter s discretion. This drop-on upper fits readily onto any mil-spec AR15 M16 or M4 lower receiver without requiring permanent modification making it a straightforward upgrade path for existing rifles. A gas-piston and pusher-rod operating system cycles the action from a closed bolt contributing to improved accuracy on the first shot of a string. The heavy duty free-floating fixed barrel system keeps the 16.25 inch barrel isolated from handguard pressure for consistent accuracy. A free-floating slimline Picatinny rail handguard gives shooters room to mount optics lights and other accessories without affecting barrel harmonics. The DFX is compatible with 100 and 200 round SAW drums in addition to M27 linked belts giving shooters a genuine sustained-fire capability rarely found on an AR-pattern platform. The upper ships with 100 M27 links included giving shooters a head start on belt-fed ammunition. The FightLite DFX is for sale at GrabAGun for shooters who want the firepower of a belt-fed weapon system built around a familiar AR15 lower receiver. FightLite Industries DFX Upper Specifications Manufacturer: FightLite Industries Model: DFX Type: Drop-On Upper Receiver Group Caliber: 5.56 Barrel Length: 16.25 Color: Black Operating System: Gas-Piston & Pusher-Rod Feed System: STANAG Magazines Belt-Fed M27 Links 100/200 Round SAW Drums Compatible Hosts: AR15/M16/M4 Lower Receivers Includes: 100 M27 Links Available At: GrabAGun