This is fairly simple, to master a weapon, you have to kill more enemies with it.
Every weapon mod in Wolfenstein Youngblood is branded into three different categories, Nadel, Tempo and Stier. In Wolfenstein: Youngblood you unlock weapon mods with Silver Coins, which you can pick up from dead bodies or find in the world as part of crates or laying loose in the environment.Ĭlick on the corresponding part and you should see three different mods for each, and in the bottom right you should find how they modify the statistics of the chosen weapon.