Brownells BRN-4 HKA(R) 416 compatible barrels, available in a variety of lengths and two contours. Historically extremely hard to procure, HKA(R) 416 compatible barrels are now available as part of the BRN-4 lineup. These barrels machined by Faxon, fit early generations of HKA(R) 416 upper receivers and components. They are the perfect fit with the BRN-4 bolt carrier group and gas block (search "BRN-4" for all parts). Available in common barrel lengths of 10.4, 14.5 and 16 inch, these barrels are suitable for any need. You can select the classic "heavy" profile, which is similar to the profile found on earlier HKA(R) 416 models, ens Mfg: Brownells