Of course you will need a barrel and a muzzle cup. A British muzzle cup will not thread on to a US barrel. An 8mm lock, or just the extractor, works fine. The real challenge to overcome is the feed block. Maybe an 8mm one can be modified, but then again, maybe not. I have no clue. If/when you find a US 30-06 feed block you will see that belted 30-06 ammo using British/Commonwealth cloth belts will not feed. The belts are too thick and vertically jam in the feed slot. I have a few original 30-06 links and they work just fine. The only currently available belts that do work are the aluminum Turkish Maxim belts that IMA has. IMA also has some steel belts, but I've never tried one. The aluminum belts work equally well feeding 8mm ammo into my MG08 and 30-06 into my Vickers. They are simple to hand load and easy to work with. Should a link gets damaged, it's a simple task to remove that link and keep the belt functional. Plus, these belts are reasonably priced. You cannot beat that.