I don't know this weapon, but being Walther, it is likely to be metric. If the screw is a hex screw, get full standard set of metric hex wrenches. One of them is likely to work.
Dear Shooter:
Just a quirk of mine: I hate hi-viz, PPCs' and Encore rifles. I reralize they're fine aditions but I just have this prejudice; I'm an old fart!
It's like these so called "muzzle-loaders" that come in a plastic buble-pac - the're no muzzle-loader - just a poor excuse for one.
I just can't help myself!
Harry B.
