I am looking for a RPK styled weapon kit for the barrel. I am starting to make another gun and this time I want a longer barrel on it so I can put a scope on it and make it into somewhat of an AK version of the DMR. I would prefer to build a milled receiver over stamped. Does anyone have any idea of what kind of cost I am looking at and if anyone has an idea of where to find it would be even better. Thanks alot.