The shotgun does not have a spring loaded ejector, but a blade one that only strikes the shell when the bolt is all the way back. I traded away my 220, but it may also have 2 extractors that hold the shell pretty tight. I know that when I got it, the factory had forgotten to fit the blade ejector and I had to peel the shell off the face of the bolt. No way it was falling off by itself. Not sure I would describe it as controlled round feed though. I thought feeding was pretty crappy. Of course the OP would also need a long bolt shroud, perhaps like used on a 223. That would restrict the bolt throw to an appropriate distance.