Steve at the Firearms Blog has all the specs and some pretty pictures of the system, so go check it out. It holds sixteen rounds of 12 gauge in a magazine which the shooter has to rotate every four shots:
Makes me wonder how hard it would be to create a magazine system similar to this, but where you rotate it after insertion to wind a spring, and the rotation happens automatically during firing. Of course, that might be a little bit too much like this for comfort of the manufacturer.
The problem with semi-auto tactical shotguns is that the magazine needs to be huge to have a reasonable capacity. This is an interesting solution.
I believe it already exists, although the firewall at work prevents me from accessing the site.
The XRAIL system is / was available as an add on rotating magazine for some of the more popular shotguns (590, 870, Super 90?).
I always wanted to get one, but never placed an order.
http://www.xrailbyrci.com
What’s the improvement over the Saiga magazine fed shotguns? Other than it works with non-Saiga shotguns?
I Google-youtubed the AA-12 automatic shotgun and ho-boy! Fun city! If they could make a semi-auto civilian version of that, sign me up!