Hello, I'm new to Glocks and just found this forum while searching for an answer to my problem. My Glock 30 SF was purchased new in Apr 12, I bought it from the original owner last month and got to fire it for the first time yesterday. He said he had fired about 200 rounds and didn't mention any issues. I was at the range primarily to fire the AR and only shot one mag through the Glock. The problem was that after every round I fired, the slide would lock to the rear. It would not feed another round until I released the slide. The original owner had installed a SS guide rod, extended slide release and Ghost Rocket connector. I don't know for sure if I attempted to re-seat the magazine but I have been thinking that that may solved the problem. Let me know what you think. Thanks.