I don't know about the .50 cal specifically, but most of the weapons are illegal as shit for a very good reason - e.g. it's very hard to target specific targets without collateral damage (clusters) or it causes extreme, uneccesary suffering (chemical weapons).
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Chemical Weapons are banned for obvious reasons, it's a nasty form of warfare and it taints the very essence of combat. Flame throwers were banned because it took too long for the victim to die, at first I was bugged about it but now there's no place for it in modern warfare.
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lol. the US has done nothing to ban cluster bombs.
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No... But a lot of countries have, and OP never referred specifically to the US.