I am in the process of a build and need an answer. I want to use a Mcmillan M40A1/HTG stock & Badger M4 bottom metal. Do I have to get the stock inletted for a BDL (I have been told if I am going to use an M4 it is the same as a BDL) or can I use one that is cut for a Badger M5? The reason I ask...