Needed some of these for using the ShockBottle bases. Easy peasy Lemon Squeezy.

Got these for my 17 round mags, to make them 15 rounders for better concealed carry. Works well, has a very snug fit on these magazines. Only thing is, this plate is plastic, not metal like the factory one I have for my 17 round mag. Time will tell if it will hold up to long term use. Other than that, this is great, literally nowhere else had both baseplates and locking plates, not even CZ's own site! Thanks for the quick response to my question regarding these BSP Shop team.

Precise tolerances. Snaps snuggly onto magazine spring. Provides tight connection to base plate.