Wouldn't the extra weight of the rear-mass transfer undue stress to the already-fragile front of the v2 mechbox? Stock mechboxes are easy enough to crack with a good stiff spring. Good stiff spring with essentially a weighted piston...couldn't last long unless there's a bunch of buffers/cushions in there I missed.
I suppose the stock tube would have to attach some other way to the lower receiver...since the extension rod is where the stock tube screw is normally.
Would like to see it for just the "that's cool" factor...I'd volunteer to destroy a mechbox or two to try it out.
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