From a purely performance standpoint, the JP comp is the most effective comp available. It's ugly, looks like it belongs on a field artillery piece, but after watching how a friends rifle just flat did not move at a 3gun match, I put one on my 20" Colt. I've got a JetComp on my 16" Bushmaster that works almost as well, and looks like it belongs on a rifle instead of a tank. I think that it would be difficult to make a compensator that didn't work on an AR. As far as accuracy goes, the JP comp changed the point of impact but didn't affect group size, this was also the case on a friends rifle.