Sorry for the delay... I ordered the fill probe and mine does not use it... had to send for another piece,,, I finall got all that and filled it. I shot about three shots way to close to tell much other than it really penetrates into a pine log end! I will have to get to a range to try much of anything. It has way too much power and noise for me to play with it at home. After I get used to it maybe but not yet... and not for alot of shots at home thats for sure. I made the mistake of aquiring several more airguns from the estate and haven't spent much time with any one yet. I will try to follow up.