Hey guys am embarking on a bren project for my WW2 outings and need advice as to how to get a top feed through the hop unit. Thought about using a P90 hop but am worried about the space for the mag to sit in. So thought i would ask whether there is a way to convert a more standard type AK hop (Basis for project is a RPK) to accept top feeding mags. Cheers for any help.