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on the magfed receivers the hole for the tube isnt milled out, even if you did drill the hole so you could get access to the tube, and put in a follower and a tubefed trigger group ( they are totally different) the opening at the bottom i think would be the wrong shape and it wouldnt function anyways
I have a mag fed grizzly and I don't think it's possible to convert it to a functional tube fed shotgun. You can certainly make modifications to it, but it's designed to be mag fed and I wouldn't risk destroying a perfectly good shotgun to find out for sure.
Yep, why would you. For the price, just buy a mag and a tube. They are not pretty or well finished, but for the price of a <insert choice of $700 shotgun> you can have a little bit of both.