Hey Jeff, yes the baseplate is removeable. I have some of these mags and they work great. Hope that helps!

the base plate is removable. This is a stock photo but you will receive this magazine which can be disassembled : google.com/search?q=Mec-Gar+CZ+75B/85B/SP-01/Shadow&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjtlLDOuqncAhViUN8KHVYxCLgQ_AUICygC&biw=1920&bih=938#imgrc=M1bOGZTxjBzkoM:

The base pad is removable. It is a flat steel piece. Most of us competitive shooters replace it with the rubber style for $9.00 because when you drop the magazines during competition they get bent to the point that you cannot get them apart.
https://czcustom.com/cz-75-rubber-base-pad.html

Jeff, the base plate is removable. This is a stock photo but you will receive this magazine which can be disassembled : google.com/search?q=Mec-Gar+CZ+75B/85B/SP-01/Shadow&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjtlLDOuqncAhViUN8KHVYxCLgQ_AUICygC&biw=1920&bih=938#imgrc=M1bOGZTxjBzkoM

Jeff, the base plate is removable. This is a stock photo but you will receive this magazine which can be disassembled : google.com/search?q=Mec-Gar+CZ+75B/85B/SP-01/Shadow&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjtlLDOuqncAhViUN8KHVYxCLgQ_AUICygC&biw=1920&bih=938#imgrc=M1bOGZTxjBzkoM: