Unless it is as Jordan has suggested, I don't think it is carrier at all.  
Is it BSF ? 
It looks like UNF Is there anything on the head? 
 
To add to Bruce's suggestion, The Australians put a small shoulder on those cam plate screws (UNF), but I haven't seen them in a Canadian carrier. (not that I know about, or that we ever received any late model Canadian carriers over here)
		 
		
		
		
		
		
		
			
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				Bluebell 
 
Carrier Armoured O.P. No1 Mk3 W.  T84991 
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. 
Dodge WC55. 37mm Gun Motor Carriage M6 
Jeep Mb #135668 
So many questions....
			 
		
		
		
		
		
	
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