Will a g3 clamp style mount fit on an ar15 flat top rail?

Helping my friend build an ar15 and he wanted to go for a very specific look. He was trying to replicate a gun from this old japanese cartoon called golgo 13. I know it looks silly to some but hey its what he wanted so I’m gonna try to help him with as much as I can. Plus I told him along with 3 other buddies whom I’m helping build their ar’s that they should all go for unique looks and make their rifles their own. This particular buddies build is the one that kinda stumped me because I have never seen anyone use H&K parts on an ar platform before. Not even sure if it would fit on the top rail. Should be interesting .Here are some pictures of the airsoft replica.

it looks like an m16 style ar with delta cheek piece/riser , 20round straight body mag and that funky g3 clamp high mount thingy. I dunno anything about scopes so if anyone knows any scopes that look very similar to that let me know. thanks