Been off the forum for a while. Came back and saw this thread and thought my input might be useful.
I have the Ark30 (mine's the screw-on type, the 1st generation of Ark30). I use it on .308, 6.5 Grendel, 6.5 Creedmoor, 5.56 and 300 Blackout. On about 50% of the rifles tried, it reduces the...