Spring blowback shell ejecting toy guns?

Not sure what category to put these in... some of them are basically model guns without the caps, some are NERF, some are airsoft-adjacent... Anyway, been seeing a lot of these lately, and some of them are pretty cool. No need to chase down rare 7mm caps either!


https://youtu.be/12ik09eI8RI?si=9yGVzSaX_Z9GTjKY
https://youtu.be/m9fkWoDB_us?si=lVrqoWCVBLMYweM0
https://youtu.be/PyHwDiyyZHM?si=-E9K56ZjFFVULHFc
https://youtu.be/0bLBsCrpxKU?si=JzcpD3sPPmkKWAMq
you get the idea.

There's some interesting electric ones out there too, that I just haven't ponied up the cash for yet ($200-300 for a semiautomatic shotgun for example) but would love to have in my prop inventory!

These toys from China are an interesting development. They really beg for modification and a paint job to get more out of them.
I own some marushin shell ejecting GBB's from the 90's (internal gas reservoir in the pistol) and from about ten years ago (1911 and cz75) with gasmagazines and room for shells.
They are fantastic. Although they leak gas easily after some time. To get them to function best, the keyword is pressure.
Great gimmick and alternative for model guns.
I like the APS CAM870 also. It can hold quite some power in the gascartridges to even shoot .68 paint balls with considerable force. Only thing missing is the smoke and fire. Would be great if one day airsoft and pfc would be combined in some way for ultra realism.

There have been some that combined airsoft and caps. I have a few. They were... odd, cheaply made, ill-proportioned... but I wish more had been done like that.
https://youtu.be/1Ra-xJpDkgw?si=PN1Dnn9SyLZ6ekvz&t=283


I'm also a fan of the APS and PPS shotguns. Need to do more experimenting with smoke effects: https://youtu.be/2Pdss1Q4N6I?si=XJt-DmTy749ictcG