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The BRN-4 lineup now includes Brownells HK® 416 compatible barrels that come in varying lengths and two contours. Faxon is the manufacturer of these barrels which can fit early generation HK® 416 upper receivers and components. To get the perfect fit, pair these barrels with the BRN-4 bolt carrier group and gas block (search for “BRN-4” for all parts). You can choose from the classic “heavy” profile or the new “medium” profile which saves weight and makes the rifle quite handy. These barrels come with commonly used ½-28 muzzle threads for the attachment of a muzzle device. They are button rifled with a 1-7 twist and have a deep black nitride finish for an extremely hard exterior and interior that is easy to clean. The longer barrel extension of the BRN-4 allows for a robust match-up to the upper receiver and a simple installation with the BRN-4 barrel nut (430-100-141). The 5.56x45mm NATO chamberings of these barrels allow for a variety of commercially found ammunition to function, as well as 223 Remington cartridges. All these barrels have the same piston rod assembly (078-000-644) and you only need to pick the correct BRN-4 gas block to match your overall barrel length (078-000-708 & 078-000-709). You should also pick up the gas block coil pins for final assembly (430-103-127). The torque recommended for the barrel nut is between 50-80 ft/lbs.