Running into a bit of a problem here, I'm helping a friend build a AR15performance 20" barrel. Its a .223 Wylde 20" but the threading is funky, 5/8 - 24. Its common for 6.8 spc and 308 or 7.62 barrels but I can't seem to find it for .223. To top it off he's going featureless so flash hiders are out. Must be a brake/compensator that doesn't have tines or advertise flash hiding capabilities..... Anyone know of something that will work?