Quote:
Originally Posted by xevous
VFC 416 has all standard internals, any v2 gearbox parts will fit fine, the gearbox is interchangable with all the other v2 VFCs. The upper is the most drastically different part, you need to get specific 416 rails as it is taller than a normal AR/M4. The grips, buffer tube, stock are all normal.
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Xevous pretty much nailed it on the head. So if you plan on changing the rail system just do your homework before buying and you'll be fine.
As for what you heard about proprietary parts such as bigger gear box and what not, your friends may have been talking about the vfc 417.