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The PMAGs for WE are modified real steel PMAG shells (requires non-negligible modifications); there are no COTS WE-compatible PMAGs. The RS mags also drive up the cost-per-mag considerably.
The 416 and M4 lowers are identical save for the shape (angle) of the lower edge of the magwell.
The tip edge of the PMAGs have to be trimmed down: if the height they're trimmed is off (mag sits slightly too low or at the wrong angle) then that could cause bolt lock to not engage properly. Otherwise the internals of the mag are entirely the same and I don't see why the bolt wouldn't lock back (although the WE bolt lock is finicky under the best of circumstances).
WE vs VFC. The WE is a workhorse that works pretty well out the box and won't set you back much. The VFC is moar purdy and has extra doodads available, but you'll be paying more for everything along the entire line and you'll probably need to do a lot of internal upgrading before you get a solid workhorse.
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