I just bought a P-10C ORS. I am thinking of shooting it for everything. As the saying goes, "Beware the man with one gun..." I've picked up 3 different kinds of magazines. For most concealed carry, I'll use the 15 round flush fit. For a back up carry magazine, IDPA and Steel Challenge competition I'll use those mags with a +2 base pad. 2 more rounds and a little more grip is a good thing. For USPSA carry optics, it's harder. As I understand it, unlike Glocks, CZ's have an over insertion problem. I have found a 21 round magazine that works fine for the P-10C. But it can be over inserted. See the picture. Does anyone make a spacer or does someone like CGW or CZC want to make a spacer to fill the gap like the spacer S&W makes to use with a 17 round magazine on a compact gun?
With a CZC 10 coil spring and thin follower, the long mag holds 22 rounds. That's good enough for me to use in USPSA Carry Optics.
BTW, the TLR-8 is really cool.