It is a .177 Did not chrony a full tank of air . Wanted to sight it in and enjoy so spinner shooting . The numbers are way off to what the rifle PA received . But they are were I was going to take it with a little regulator changing . So I am happy with it as it is set . 9 grain 860 fps , 9.75 grain 839 fps , and 10.5 grain 800 fps. They state the rifle is regulated at 1150 psi . With a shoot count of 70 . PA chrony 10.43 at 905 fps . At shoot 80 mine fell of the regulator and the tank gauge was right at 900 psi . not 1150 . But I planed on setting a regulator at 900 psi . Not the most scientific way of doing things which leaves a lot of room for assumption . But it is the out come I was after . Did not punch paper for accuracy today . But by looking at the small grouping on my spinner things are good . This is my first magazine rifle so I am not a expert . But on several occasions the last 2 pellets would not rotate to be loaded if I did not press the mag back down a little . Will have to shoot it some more and see if that gets better or worse .Marvin