I have a 12 Ga Double Barrel Shotgun that I inherited from my Grandfather and according to my Grandfather it belonged to his father. I have a few questions and concerns about the shotgun since I don't find any answers on Google. I have never shot with the shotgun before and don't remember my Grandfather shooting with it either since the stock is damaged.
My question(s) is the following:
On the barrels and frame is the name "FABRIQUE NATIONALE D'ARMES DE GUERRE HERSTAL-BELGIQUE" but on my license under 'make' it states "BROWNING". What is the real make of this shotgun?(Photos attached)
When was this Shotgun manufactured? (I believe it might be 1924)
Then my MAIN concern is this... When I took the shotgun to a gunsmith to build a new stock the "expert" told me that this shotgun can only shoot BLACK POWDER rounds. I did some research on Google of the proof marks and the barrel do have Black Powder Proof proof marks, but I also believe it to have a Nitro Proof proof mark.
Will this shotgun be able to shoot modern smokeless powder rounds without blowing up in my face? (View photos attached of proof marks)
Thanks in advance