So.... would this be considered a new build requiring a new upper/lower or will anything I've got coming from LaRue work? A search @ LaRue for anything 6.8 turned up nothing.
That's the beauty about the AR-15. You can just build another upper! Slap a barrel on an upper receiver, outfit to your liking with bolt, charging handle, optics and swap out uppers on your lower. Of course you'll probably end up wanting another complete rifle so you'll build another lower to go with it. Damn things are like Lego.
Admittedly, I think I enjoy specing out and building the rifle more than I actually like shooting them and I don't mind shooting them.
.458 SOCOM is sooo cool too. But you pretty much have to reload it.