I've got one on my Anschutz 1808EDS. I'm no tuner "expert" but this is a well made bit of gear and I found the fellows at Huntsman very good to deal with. They bored this to the barrel diameter I requested and it's a perfect fit.
Probably best to call them and ask. That 1808 pictured above is threaded 18X1. I had a bush machined with that thread and O.D. same as the barrel. Huntsman bored the tuner to suit and it clamps on and stays put.
I'm thinking of trying one of these on my Vudoo & Bergara. They're threaded 1/2X28 but EC supply an adaptor to suit: