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		 "a .50 cal isn't inherently more capable of taking a plane down than a .308" 
 
You make decent points, but that one just isn't true. It IS inherently more capable of disabling a plane, but that's not the main problem. 
 
I would retort that there's no imaginable reasonable civilian use for a .50 cal sniper rifle (aside from shooting expenisive bullets at targets for the hell of it). It's not like there's no line. There IS a line. Machine guns aren't outlawed due to rate of fire. They're outlawed because they're a battlefield weapon that offers greater firepower than a civilian should need or have. I put the Barret on the military side of that line. 
		
		
		
		
		
			
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