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No. For the simple reason being that by the time you get to the part where the rear is exposed, you may as well open it up the normal way.
The only benefit of "quick-change" gearboxes are in guns where the rear of the mechbox is accessible without removing the mechbox. (ie: A&K M249, PTS PDR-C)
As for the ones currently floating in the market, I have yet to see a quick change gearbox executed properly with the correct dimensions and specifications.
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