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Well I guess that 30-378 thingy would have to feed like the SafetyHarbor one, from the side, since no AR has an action long enough for it, unless you're talking about building a whole new upper and lower just on the AR design. With 30-378's ability to wear barrels, maybe one mag rapid fire would do it? It would need a quick detach barrel and you'd need a bunch of spares in your range bag. Or better yet, have a magazine feeding new barrels.
