My own limited experience of one box of Minishells parallels loader's. I got about 50% feeding with them in my 870HD. I don't know all what it entails to modify the gun for 100% reliability, but since recoil isn't a grave concern for me I'm not worried. It would be nice though for the urban gunowner in riot-prone areas to have the capability of 11 shots in an 18" barrelled shotgun. Hopefully someone will come up with a drop-in shell lifter that can do the trick.