Not sure I understand first question- if I put one round in the pistol and fire it will fire and then slide locks on empty mag.
They did black nitride the slide but the barrel seems pretty loose in the slide. I do have another barrel (threaded barrel) that I could try and see if it does it with that. Btw, seems to happen about 1 in 50 rounds. Not frequent.
Mcameron, if I sling shot it does load. But a couple of times the round gets so jammed against the bottom of the feed ramp that it won’t. The slide feels very smooth when just working it back and forth. Have a G19 and G17, feels just like they do.