FN makes barrels for the US military, and supplies both M4 and M16 rifles to the military. FN is one of the premier manufacturers of military spec barrels. This barrel is button broached, as is military spec and used by FN, Colt, LMT and other military providers. Featuring the military standard 1:7 twist and chambered in 5.56 NATO, fully chrome-lined and the newer mid-length gas system and M4 feedramps, this barrel is ready for your URGI build or any AR / M4 / M16 style rifle, either as an upgrade or a new build.
The unique 14.7" length allows for a standard A2 birdcage flash hider to be pinned and welded to allow for a "street legal" (non-SBR) rifle barrel.
The FN America 14.7" 5.56 Button Cut Carbine Gas AR-15 M4 Barrel is a premium barrel that lives up to the battle tested reputation of FN America. The barrel is designed to be extremely durable and reliable with a high-strength 4150 CMV construction and a Black Manganese Phosphate finish.
This barrel is chambered in 5.56 NATO/.223 Remington with a 1:7 twist rate and 1/2” x28 threaded barrel for optimal performance and functionality. It boasts a chrome lined chamber and bore to extend the barrel’s service life and ensure reliable chambering and extraction. The 5.56 M4 Barrel features a M4 feed ramp to promote consistent and reliable feeding.
FN barrels are High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) to ensure that it is free of micro-stresses, cracks and flaws to ensure the quality and consistency of each barrel. In addition, to the rigorous standards and specifications for each barrel, FN has years of battle proven experience.
Note: Charlie's also sells the 16" FN barrel profile in cold hammer forged barrel: FN 16" midlength chrome-lined CHF barrel The difference between these two barrels is extremely minor. Typically, the US military uses FN button rifled barrels. The cold hammer forged barrels are sold in commercial markets, and CHF barrels make for very predictable and repeatable production quality. The hammer forge process is different that button rifling, and hammer forged barrels are very capital intensive, and often cost more due to the very expense forge machine. Quality between button rifled barrels and hammer forged, both with chrome lining will be quite similar. They will have equal durability and similar accuracy. Precision barrels with button rifling will tend to be more accurate than a hammer forged barrel, but in a military production environment, we cannot see any difference.
FN replacement part number 20-100044