Third round at the range, slide wouldn't go to battery. OMG!!, this thing NEVER has a malfunction! Then I remembered this is the first time I've shot it since a thorough cleaning. I put the recoil spring in backwards and it slipped past the notch on the guiderod. I have been carrying this way for 2 weeks! I learned a couple of lessons. The recoil spring only goes in ONE way, and always testfire your carry piece after disassembly.