Well, I thought I knew what I was doing. I currently have one gun that is a Belgian of '84 production, thought this was a MKIII. Problem comes today when I was scoping out a possible new aquisition. My gun locks on the barrel hood while this one has lugs ala 1911. Which is which? S/N starts 245Pxxx so I know its a '80s commercial gun of Belgian production, can't remember the second letter. Are aftermarket barrels made for both, opinions on wither, I'm kind of partial to the locking lugs myself.