Well, like Fernando, I think .45 is a bit OTT for a signalling device. I also notice that none of the cylinders seem to have any backplate apart from the one being fired so friction only is keeping the cartridges in place. I would worry that following a few vigorous tugs of the lanyard a few of the remaining cartridges would be shaken out. 
Regards 
Richard
		 
		
		
		
		
		
		
		
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