Hello. First I want to say i'm new here.
I have a classic walther p99 gen 1 BB gun. Signed by walther. I'm already surching 1 month for a light that fits the special rail. Can someone please help me find a lamp that fits? (I don't have a lot of money)
Welcome to the Forums. I am not sure but you could try doing a search for a Gen 1 rail adaptor. If I am not mistaken your P99 BB replica is similar in size, shape and the frame will have Gen1 characteristics.
Why not post some images in the Rim Fire and CO2 section to show off your baby and let us get a better idea of the issue.
Until that time welcome and enjoy yourself here. We did get too many with your style weapons on the Forums so it will be interesting to get your views.
If it were a CP99 in .177 cal you shouldn't have too much trouble but the older style with the Gen 1 rail will be troublesome.