I'm sure this has been asked before, so sorry if I'm asking again for this info, I have a Sanders 6.5 AR Grendel side charging upper, and to me the charging handle is a bit week IMO, BCA sells a better BCG with a much better handle, but is tagged as a 5.56 bolt head, I know the bolt heads need to be swapped out, which is what I'm asking, will the 5.56 BCG work with my 6.5 Grendel bolt? are they interchangeable? BCG's, thanks for your advice!