Another update.
Spoke with Armory earlier this AM. Their mag base pad product image is NOT current. There is NO hole in the bottom of the pad.
The current product has a set screw coming in from the top. That does NOT work for my factory restricted mags because the position of the screw hole (too far inboard) does not allow insertion of the screw.
At least the guy I spoke with at Armory said they know of the image problem and will correct it.
I've looked really hard for an extended pad that is (1) flat on the bottom (I don't care if there is a logo - but only a logo), (2) has the center hole to engage and restrain the pad using the factory "magazine base lock" with the protruding pin on the bottom to fit into the hole in the base pad, and (3) will correctly fit inside the CZ factory magwell (
https://shop.cz-usa.com/aluminum-magwell-large-frame-black40280.html). But I've been tapping out. My last (?) try is Springer Precision - who I've e-mailed (they don't accept phone calls) re my combo. Not hopeful, the pad images appear to show that its front edge is too far forward to fit inside. Ugg!
The journey continues...