I really like my Tier 1 Aegis holster with the claw. Unfortunately the screw which holds the stacks in the holster fell out and I lost the stacks somewhere while walking.
Tier 1 Concealed sells the stacks and they are reasonably priced, but shipping costs almost twice what the parts cost.

I designed my own replacements which perform in a very similar manner and as an added bonus they work with the Tier 1 stacks as well.

I printed in PETG, but PLA or ABS would work just as well. I used 3 walls and 25% infill which just about makes them solid.
I did not need supports when printing with the female socket side down on the build plate, but your printer may need them.