For those who are experiencing the slide failing to stay open after the last round is fired -
Having owned two BG's, (previously the original with the integrated laser and now the MP version) I noticed how "magazine sensitive" these little 380's are. I was also having a problem with the slide staying open until I read that the mags should be cleaned up periodically, with special attention given to the to the red plastic follower which gets fouled up with carbon deposits after repeated firing. This is a very simple procedure to take apart the mags, and clean them up with a gentle solvent, Q-tips and a cloth. Been doing this for awhile and no longer get the "closed slide on the last round symptom". That is, until the followers get gunked up a few hundred rounds later, then just clean them up again.
It's easy to test if you're successful cleaning up your BG mags -
Insert an empty mag into your BG, and rack the slide all the way back, then release. If the slide stays open, you're good to go, if not your follower needs more scrubbing.
I also number my five mags so I know which is which. Been doing this procedure for awhile now, and it has worked well for me.
PS - For those who have newer BG's that haven't been completely loosened up during the break-in period, and the mags will not insert without depressing the mag release button - don't worry, bear with it. Your BG mags will eventually slip in with ease once it's broken in with some extended use.