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					Originally Posted by  thatguy96
					 
				 
				The larger version I have pretty much rules out the Ontos.  There's no superstructure like the Ontos has.  The M40 is also held in place with a barrel clamp, which looks more likely to have been held over from the gun on the M56. 
			
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 Looking at it more closely (with the aid of magnification) I'm pretty sure that is, in fact, an M56.
You can see part of the gunshield.