WERYNICEEE!
Credit where it is due sir! Very cool stuff. I've got some of those OpSol adapters, gen 1 and 2 and their complementing follower, but I haven't had the time to test them out. I need to go and have some fun at the range. Life is just work-work-work these days. People seem to have good results with them.
The neat thing about the shorty shells for me is reloading. After a couple reloads of conventional length 12 gauge the shells don't like to take a crimp anymore or are too thin/brittle from the heat exposure, so you just trim off the end and voila! Brand new shells with a primer pocket squeeze, and more reloads, just in a shorter format.
I think I know what shotgun you are talking about, Is this the one? : https://modernfirearms.net/en/shotguns/south-africa-shotguns/mag-7-eng/
You know I've always wanted to learn how to design man. I'm an ideas guy, but I need to try and get involved. I'd love to be able to make my own designs for my saiga 12 and other firearms since it's not a very developed area in the space, a few designs here and there. My idea for your design is to hunt down a double stack mossberg magazine, cut it open and study it's internal geometry and adapt it for the mini shell lengths, but I really like your single stack design as well. I hear you about the open bolt challenges, be careful testing with OOB my friend and stay safe. GOOD LUCK! It's awesome work.
That's absolutely dastardly. I love it. I have thought about a single stack mag fed mini shell shotgun for so long, MANY years. Or somehow converting a saiga 12 to minishell mags. The only thing you really need to worry about is rimlock of the shells. I would LOVE to see this released. It would keep me from designing a pump action mossberg receiver that's mini shell only length. I keep thinking it would be nice to have a super compact pump, but this looks like it would be blowback awesomeness.
It may have actually worked if he knew how to use the wrench. You must always turn the adjustable wrench to the side that has the moving jaw. He turned the wrench to the side with the stationary jaw. Cool channel though.