FightLite DFX AR-15/M16/M4 .223 Remington/5.56x45mm NATO 16.25in Upper Receiver Heavy Short-Stroke Gas Piston 1-7 Twist 1/2x28 Manganese

FightLite DFX AR-15/M16/M4 .223 Remington/5.56x45mm NATO 16.25in Upper Receiver Heavy Short-Stroke Gas Piston 1-7 Twist 1/2x28 Manganese. In addition to feeding from M27 linked ammunition the innovative DFX retains the ability to seamlessly transition to standard box type AR15/M16 magazines at user discretion hence its patented Dual-Feed capability The new DFX is specifically designed for responsible armed citizens law enforcement and professional security personnel who wish to upgrade their rif