Grouse, the problem will be the receiver. If SIG used the same receiver for both the SA civie model and the FA military, it's unimportable. ATFEs' favorite song," Once a Machinegun, always a machinegun." Doesn't really matter if SIG made it Semi-only, if they used the same receiver,the ATFE will state it's easily convertable. 
 
An option would be to see if anybody makes an American receiver in Semi-Auto and buying a 'kit' to build one with.
		 
		
		
		
		
		
		
			
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