How about this, PF218187. I know its not a L8xxx, Its a no4 mk2, yet its a 7.62nato. Interestingly, it was at some point Regulated by Fultons for target shooting. From what I can find so far 1800 were made in that batch I think?....it maybe its a conversion? or it maybe that batch were all 7.62nato? for trials and this is a forerunner of the L8 guns? I cant determine. Im going to look at it shortly to see what other detail I can get off it. Advice on what to look at to try and determine if its original or a conversion would be appreciated.