Yeah, I used 9mm and .38 slugs to make mine. My display mag in my case is still holding up fine. The one I keep slamming in and out the PR, not so much. (Rounds came loose). Since the mags are designed for .45ACP, using that would work better than either route I took, but it's true it wouldn't be 10mm. (Although how they would fit 95 rounds of 10mm in there I have no idea, even if it caseless).
For sourcing mag bases, I was able to contact Evike and get a spare mag base bottom. I know there was a thread somewhere about trying to get a bunch of people to contact them in hopes of them being to batch order a bunch. I don't know if that ever got off the ground though. Spat offers resin spare mags, possibly he might be able to provide something (although I don't know if that is something he would do). Since you just want them for display, you might be able to make a mockup and cast it yourself; it's not a complicated part.
Charlie
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