First Look: FightLite Industries DFX Upper Receiver

A belt-fed upper receiver for your AR-15.

by
posted on August 26, 2025
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Flightlite Dfx

FightLite, a company known for its belt-fed-style, AR-15 pattern upper receivers, has recently unveiled its next generation FightLite DFX upper receiver group. This new complete upper assembly consists of a freefloat, heavy-profile barrel that is shrouded by an M1913 Picatinny quad rail handguard. Additionally, FightLite Industries also offers an M-Lok-compatible option. In addition to feeding from linked ammunition belts, the DFX has a dual-feed system that accepts AR-15 pattern magazines.

For added reliability and ruggedness the new FightLite DFX uses a patent pending short stroke piston assembly to cycle rounds compared to the traditional direct gas impingement mechanism found in many AR-15s.

DFX upper receiver groups are designed to drop into any standard AR-15 lower receiver assembly. They also do not require any permanent modifications, nor do they alter the function of a standard lower receiver.

FightLite DFX Belt Fed Upper Receiver Features and Specifications

  • Caliber: 5.56 NATO/.223 Rem.
  • Barrel: 16.25-inch heavy profile
  • Rifling Twist: 1:7 inches right hand twist
  • Muzzle Threading: ½ inch by 28 TPI
  • Gas Mechanism: Short-stroke gas piston operation
  • Feeding: Dual-Feed - Accepts AR15/M16 magazines and M27 linked ammunition belts
  • Precision Machined 7075-T6 billet upper receiver, feed cover and charging handle
  • Precision Machined feed tray
  • Finish: Manganese phosphate and Type III, Class 2 black hardcoat anodized
  • Free float handguard with MIL-STD 1913 Rail
  • Ships with main action spring, bolt catch, carbine stock spacer, (100 count) M27 cartridge Links and operator’s manual
  • Made in the USA

DFX belt-fed uppers retail for $3,995. Visit FightLite Industries’ website at fightlite.com to learn more about the new DFX piston operated upper receiver group or other products from FightLite.

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