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FM Products offers Brownells exclusive barrel kits that come with an included gas block, ensuring proper alignment and a good gas seal each time. The gas block indexes with a small cutout in the barrel, eliminating concerns regarding short stroking due to a canted gas block. This pre-cut gas block and barrel feature roll pins for a robust attachment method without the worry of set screws coming loose.

Choose from three barrel lengths; 16 inches, 13.9 inches and 12.5 inches. The 13.9-inch option is perfect for pinning and welding muzzle devices while the 12.5-inch barrel is ideal for pistols or SBRs. These barrels are machined from 41v50 steel, chambered in 223 Wylde with a 1-7 twist, providing optimal performance with military-style or heavy bullets. The 223 Wylde chamber can accommodate both 223 Remington and 5.56x45mm NATO ammunition equally well. Muzzle threads are ½-28.