Playing around with the tube SMG & the Aguila 12GA mini-shells...
Thanks! :) Yeah, I like the mini's a lot. I use them almost exclusively in my tactical Moss. There's a tough rubber wedge you can insert that makes using the shells hassle free. I got the main idea from that South African version with the mag in the grip. This design is so much easier to alter, & rim lock is easy to avoid by careful loading... I've had some picky .22 banana mags that would lock up if the rims wheren't in perfect order.
What's cool is that this is actually a very simple, proven design... 3D printing & all the metal from the hardware store. Modern Bill Holmes style. The only real drawback is that it's full auto, open bolt. That makes building one "a bit risky". I need to play around with it & see if I can find a close bolt semi for the action...