Spacer for the UpLULA to keep 9mm single-stack mags from wobbling & annoying the hell out of you. Works with Sig P938 (7rnd) and Kahr K9(7 & 8rnd) most likely others.

The .stl is 55mm tall. Might be too tall for 6rnd mags, but haven't tried it yet. You can z-scale it. PETG is a slip fit, the ABS I printed 5mm off was a little bit tight but worked fine.

It could be shorter, it could have holes to make it lighter & use less plastic. I don't think it could be simpler to work up in CAD and it cost all of $0.75 for me to make. Take that $15 OEM adapter.