hi there take your stock off. at the back of the gun you will see a small hole there is a hammer tension grub screw in there. find a alan key that will fit it. then on the bottom of the gun there is a hole that lines up with a hole on the front of the hammer. place a small screw driver in here just to stop it from turning. now turn your alan key on the back. (out) make sure you leave it just biteing on the last of the thread. you should now be up at about 17.5 ft/lbs give or take some. if you need more power from it drill out you transfer port by 0.5/1.0 you should now be around 18.3 ft/fbs. if you need more you can strech your hammer spring about one and a half inches. this should have you at about 22ft/fbs (only do this if you hold a fac)it is illegal to do if you don't and you do not want that!!