Taipan Veteran Magazine and single mag holder 3D printed

I read that slugs fall out of the mag but I have no firsthand experience. I wonder if you made a second oring slot in the mag that it would help in holding slugs. Then removing the oring for pellets. Just an idea and not sure how many are using slugs anyway so maybe not worth your trouble.
Can you give me an accurate OD (in mm) of the magazine, as well as the thickness of the main section and the raised section of the indexer? You'd need a caliper to measure it. I think I can extrapolate the Veteran mag and get close.
 
Just for clarification. Here are my .22 Mutant mags:
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