maybe it is on the older ones
This is a droop compensated scope mount for the RWS34, some call it a canted weaver/picatinny rail. Since most scopes don't have enough elevation to compensate for the barrel droop on most 34's. I use one on my 34 and it works great. Of course you need Weaver/picatinny scope rings to mount your scope onto this weaver style scope mount.