At the range today decided to fire the gun in DA. Had put about 150 rounds thru the gun since new, most in SA. The DA is not too bad a pull but I was getting 2-3 misfires on every cylinder. Have not done any gunsmithing on the gun!!! The 17C is a 8 shot .17 hmr, 4" barrel in SS. I haven"t cleaned the gun since the initial cleaning nor did I take the side plate off. The gun will fire every time in SA but not in DA. I"m going to take a big guess here that it"s not just dirty, but could something be hanging up the firing pin? I"ll wait for a few replys here then ask Taurus to send along a new hammer spring. I did have a PT145 that the recoil spring died after only 50 rounds. I was using Win. and CCI ammo and it didn"t matter if I was staging or pulling straight thru. Thanks in advance for the help!