Similar Problem
I had almost exactly the same problem.
Situation: Brand new Bodyguard 380 M&P (no laser), paid for it and immediately took it on-range to try out different kinds of ammo (to see what would work best) and make sure it worked properly.
It didn't, even though I tried it with 2 different kinds of ammo (hollowpoints and some FMJ practice loads).
My process was: I would put 5 rounds in the mag, rack the slide to get the first round into the chamber, and begin firing. On most occasions, the first four would go just fine, but not the last round.
After firing the next-to-last round, the slide would not go all the way forward to prepare to fire the last round. (I think the term is that it would not "return to battery"...isn't that right?)
Instead, the slide stopped about 1-2mm shy of where it should have gone, and the last round wouldn't fire.
So, when I tried to eject the unfired round by racking the slide, the unfired round would not pop out; it just stayed there in the chamber. As I inspected it, it seemed that no part of the extractor was gripping the back of the cartridge; instead, the cartridge was entirely *ahead of* the extractor's "claw." So, naturally, it had nothing to "pull on" when the slide went back.
Any ideas how to fix this?
(Every time but one, the problem was with the last round. Only once did it fail on a cartridge in the middle of a mag. All told, there were probably 60 rounds that I attempted to fire, with around 8 failures, 7 of which were on the last round.)
I picked up a new BG380 on Friday. Went to the range yesterday to dial in the laser and about 5 rounds out of 50 did not eject. It was almost like the next round was hitting on the spent round and causing it to hang up I would have to drop the mag and use my finger nail to remove the spent casing from the barrel. It would occur at different levels of the mag. Sometimes the second, third, or fourth round. Well I forgot my adjustment tool for the laser so I went back to the range today with another 50 rounds and again about 5 to 7 times no eject. one time on the same mag. Anyone else having issues. I have read about the trigger problems and the take down pin backing out and I did not have those problems.