its a 17hmr. it is actually the 3rd 17hmr i have owned. i sold one and traded the other one for a pickup truck. i really wanted a 17mach2 but couldt find one anywhere so i just bought another hmr. i really like the accu trigger. i have it on one of my coyote rifles also. i was using my 10-22 but the trigger pull is terrible on it. i need to get it worked on.