Hello everybody! I recently got a Glock 27 .40 from a buddy of mine. It has an interchangeable 9mm barrel (wolf) with it that he used, but I have found that it jams alot when used. I'm thinking that I need to get a recoil spring for 9mm, but I don't know what to get. I found a site where you can get them, but they range from 14-24 lbs. All it tells me is: 14 lbs = reduced power, 16 lbs = factory standard, and 18, 20, 22 & 24 lbs = extra power.