The G19 Gen 4 was the 3rd gun I bought and I was going to use it as my EDC in place of my S&W M&P 9. I experienced several stovepipes/FTE's, thus shelving the EDC idea. Searched several forums, and I found that there were issues with the early Gen 4 recoil springs, that Glock would send out a replacement, if called and asked for one. When I did, I read off the 3 digit number on the spring and the Glock tech informed me that it was the new spring being sent out. He suggested shooting 124 gr, rather than the 115 gr that I was using, to break the recoil spring in.
Like I mentioned in a previous thread, I'm now more comfortable carrying the sub compacts with anywhere from 3"-3.7" bbls. Along the lines of Hans advice, I purchased a H&K VP9SK, which feels and carry's much better than the G19 would have been for me.