Thanks for the good info... I wasn't aware that the design was specific to the faster/lighter 5.45 round, but that makes perfect sense, and probably also why you see the Bushmaster-AK series of rifles where they fit an AK-74 style brake on their ar-15 rifles.
I checked out Dyna Systems (
www.dynasystems-ltd.com) and they have a brake called a Master Blaster, which claims the best performance against muzzle flip, plus it looks pretty cool, but expensive as well. Looks like they are custom made.
Anyway, not to request legal advice or anything, but when a post ban has had the original threads ground down, isn't it best to use a threaded adapter, and weld it in place or just weld the brake directly to the barrel? Assuming one has enough US parts etc.
Here's a pic to the my project Maadi, with RSA trigger FCG & K-Var OD stock set. Added a mojo peep sight, and a holosight, which seems to hold the zero well given the reciever cover mount.
Maadi pic