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FM Products has developed an exclusive barrel kit for Brownells, which includes a gas block that guarantees proper alignment and a tight gas seal. The barrel features a cutout that ensures the gas block indexes perfectly every time, eliminating the risk of a canted gas block causing short stroking. This kit is also designed to include pre-cut roll pins, eliminating the need for set screws that may come loose. The barrels are offered in lengths of 16, 13.9 and 12.5 inches, with the 13.9 option being recommended for pinning and welding, while the 12.5 is ideal for pistols or SBRs. Machined from 41v50 steel, these 223 Wylde chambered barrels feature a 1-7 twist that ensures optimal performance with military style and heavy bullets. The versatility of the 223 Wylde chamber accommodates 223 Remington and 5.56x45mm NATO ammunition equally well. The muzzle thread is ½-28.