Rifle is about 8 years old and been stored for about a year and a half . Started out as a .177 and still has the .177 valve spring in the valve . I pulled it a part and repaired the air leak . Cleaned it up and lubed everything . Removed the heavy spring I had in it and put the talon tune heavy hammer in it . I have a TT tank adapter on it to lower the tank .Which allows me to tether and regulate it . It pick up a little energy the second time of running strings . 48 grain 10 bhn .2495 bullets were used . First string was not tethered or regulated but the rest were . Not the most powerful . But it will work for me and should yield a lot of shoots per tank . Might replace the frame it has a lot of wear from the chocking handle . Asked AF for a price will see what they say . Marvin