Airguns with crappy factory mags

What airguns out there would you all like to see some good aftermarket mags for? I'm currently working on the AEA HP/SF lines in all 3 calibers and a couple sizes, but after that I'm looking for my next big project.

If you can't think of mag ideas I'm open to other 3d printed accessory ideas.

So far on my research further list
Hatsan Jet 1/2 and 3 if its compatable with the others
Air Venturi Avenger
JTS Airacuda specifically single shot tray
Red Panda
Macavity MA2
AEA Challenger
Air Arms S410/S510

If I ever see a mag for it in the wild I'll attempt
Bantan Brocock XR
Daystate Revere
 
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