I know this is stupid, but nevertheless...

How is that possible that you cloak your weapons when you turn stealth mode on? They don't wear any nanosuit, do they? I understand non-cloaking weapons would spoil the whole sense of cloaking as weapons floating in mid-air would probably look kind of suspicious.

On the other hand, while you're cloaked, you're almost completely invisible, yet you cast a regular shadow. How does that work? This one could be tweaked a bit, without spoiling the game, so you would also drop an almost invisible shadow.

This is beyond anything we're presented with in-game, so is pure speculation; but if the crystals were replaying the image on to the other side of the nanosuit, a shadow would still be cast unless they could replay the image with the same light intensity as the original light source. This would be easier to do with artificial light than with sunlight (theoretically). In this way, the stealth enhance upgrade could be seen as some kind of upgrade which allows a higher light intensity to be replayed, matching the original light source and thereby removing the shadow.

As for the gun - I have no idea. It doesn't share the nanosuit surface, so can't have the crystals, and theoretically would require some electromagnetic light manipulation to make it invisible.

..but who cares man enjoy the game! lol