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The internals are identical. The CQBR will be more maneuverable in close quarters and won't sacrifice any accuracy. All the VFCs are pretty good and come highly recommended from this forum, so take your pick in terms of aesthetics. Again, for VFC M4s, choose the gun you like looking at and holding the most.
As for upgrades... Run it stock until you run into problems. The hopups, buckings, and inner barrels of stock VFCs are already pretty good and shoot straight like a laser for indoors and are typically good enough for outdoors. If you want a bit more ROF, put in a mosfet and get 11.1V lipos. If you still want more, do the previous and get a faster motor. If that's still not enough, do the above and get a high speed gear setup. The barrel grouping should be plenty good until you really start an overhaul on the gun.
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