Hi Guys - I need some help, I don't know which direction to go. On my G3, 19 completely stock parts and set up. Has thousands of rounds thru it - no problems. I have done the .25 trigger job along with Dave and 3/4's Extractor fix. (all casings almost land in a hat on the floor now) However lately, the slide does not lock open on the last round. I have used different mags - same problem. I have tried using different numbers of rounds in the magazines. Makes no difference, the slide doesn't lock open on the last round. Any suggestions on how I can fix this problem.