Good brake, horrible coating - Blackout Defense Keymo Hybrid Muzze Device

The hybrid break is great, works well, very solid, feels much better than the included Dead Air three prong flash hider. I have three of these however and the coatings have all been the same in that they appear much more like a phosphate coating, with entire areas appearing to strip off the brake under very mild suppressed use, indicating that the coating is not melded into the metal the way that BN is supposed to but rather sitting on top and too soft to stand up to the heat and wear of three different suppressed BCM ARs, 11.5in, 14.5in, and 18in, which is more disappointing considering I had them pinned and welded to the two shorter barrels