FN 5.56 Button Cut Rifle Length Government Barrel – 18”

FN 5.56 Button Cut Rifle Length Government Barrel – 18”


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FN America’s 5.56x45mm AR-15 barrel is a high-quality upgrade to any AR build. The 18” barrel features M16 styling with mil-spec steel construction and a black manganese phosphate finish. The rifle length barrel has a chrome lined chamber and M4 style feed ramps compatible with 5.56x45mm and .223 Remington that help extend barrel life while providing consistent, reliable feeding while shooting. It is threaded in 1/2×28 with a 1:7 RH twist rate.


  • 18” barrel chambered in 5.56 / .223
  • Machined from mil-spec steel
  • Chrome lined chamber
  • M4 style feed ramps
  • Rifle length gas system
  • Threaded 1/2×28
  • Black Manganese Phosphate finish

Additional information

Weight 33 oz
Dimensions 15 × 2 × 2 in
Thread Pitch



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