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					Originally Posted by  scottw
					 
				 
				curious that this is "ATF Approved"...I thought they were all caught up in "curbing gun violence"...or maybe that's just since Sandy Hook 
			
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 My understanding is that they fall into a grey area when it comes to the ATF definition of automatic weapon.  Technically, the gun still functions within their definition - only one bullet ejected from the barrel per pull of the trigger.
From what I remember, the ATF has tried to leverage "physical effort" in order to make a ruling against the stocks.  Interestingly, many current models of the stock ship with a copy of the ATF letter stating the aftermarket stock has been evaluated by the ATF and is currently legal.
http://www.slidefire.com/downloads/BATFE.pdf