I tried searching, however struck out with the search!! Curious about what is out there for a replacement barrel for a Glock 20, gen 4?? I'd like to find something that is a "drop in" barrel if I can find something, Right now I we have been shooting jacketed bullets, however I have a number of Rim Rock 200 and 220 grain hard cast bullets that I would like to shoot up. I was told that the Rim Rock bullets "can" be shot in the Glock 20, I am just not certain and would prefer an aftermarket barrel if I can find something. Also this will serve as a Christmas present for my son. We carry the 20s while black bear hunting, just a little extra security if we need it, and...it's always by your side. I'm not looking to go crazy, something that is going to "work". I have read on this forum where a heavier recoil spring and guide rod are recommended as well. Any feedback would be appreciated. There's lots of literature out there, curious about what other forum members have encountered and what they are using?