i have two, a 10/22 conversion and romanian military trainer 22 conversion, both are accurate once you get used to the romanian military trigger. they are not viable(imo)for more than 30-35 yards for reliable killing on anything other than grays.reds(fox squirrel)should get 17hmr or 22 mag.they do have the advantage of being much quieter. at 75-100 yards the 17hmr does great on muskrats,the mach2 is not a reliable killer on them at that range and head shots on a swiming muskrat is not within my ability 100 percent of the time. my experience has also been the 17 hmr is more accurate than the 17 mach2.