Don't fret, lots of guns come with el cheapo magazines.
I've had the welded on base plates, (that weren't), come flying off with all the rounds.
Throw that junker in the trash and just buy a handful of good ones, like Chip McCormick, Wilson, and others.
There's a reason they are in business.
You need a bunch anyway.
Can't have too many.
Lock the doors, they're coming in the windows.