The 3,6GPB/StmG notes 3,6 grams of Gewehr Blättchenpulver(military flake powder) over steel metal jacketed bullet and was a stamp used from July 23rd, 1893 till the rules change in 1912 so the construction of the sporting weapon must have commenced say around 1911 & saw completion between 1912 & WWI.

Would like to see an image of the 1g1111 stamp.

Kind Regards,

Raimey
rse