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		 Gatling style designs are a bit of a grey area. They don't actually fire more than one bullet per pull of the trigger, the primary (and extremely basic) definition of a machine-gun. They are more akin to putting a cam assembly in your existing autoloader and spinning it quickly to activate the trigger in rapid succession. I do believe those items were made illegal later, so Gatlings may be illegal by proxy. 
 
I cannot see why the govt would make normal machine guns illegal without somehow including Gatlings though, so I could be off with the "grey area" comment. 
		
		
		
		
		
		
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