I thought by now Drew Hause or PeteM would chime in. Many of the locks are 5 pin and above. I was just curious as to how it was configured. Nitro proved for 12x70mm with both tubes choked, but I can't see the actual numbers, if there are any. The "1k467"? is the weight of the tubes so you can compare to see if they have been cut.

Here's Littlegun's FN site but I don't see any scatterguns:
http://www.littlegun.be/arme%20belge/fn/a%20a%20fn%20gb.htm

Kind Regards,

Raimey
rse