Since there are Glock experts lurking around on this thread I have a question. My practice Glock is a model 19; I don't know which generation. I bought it years ago as a police trade-in. I've run well over 10,000 rounds through it, and maybe closer to 20,000. I've had the trigger spring break twice, a few years and thousands of rounds between the two. The first time I had a gunsmith fix it because I was really busy back then. Last time I replaced it myself, this time with a heavier spring that I got from Glockstore. The spring only costs a few dollars, but when it breaks the gun is out of service. So what I want to know is this: is this a common problem for Glocks, and is there anything I can do to keep it from breaking again?