BROWNELLS BRN-4 UPPERS HK416 compatible upper is the pinnacle ofreliability when you can't leave anything to chance! SHOP BRN-4 UPPERS SHOP COMPATIBLE RAILS . Looking to make your AR as compact as possible while maintaining compatibility with your favorite stock and ensuring full functionali...
Brownell's 416 (BRN-4) 417 (BRN-7) Builds An UNOFFICIAL (unless mods bless it) thread dedicated to the builds centered on the HK based BRN line of receivers. Post your pics and or reference materials used for your builds here. Whether they have MR uppers, 416/417 uppers, etc, etc...