Whats the cheapest option to go full metal?

Iv been wanting the 416 for some time now but i really want it in metal. Hawkxtactical has a full metal kit for about 370 but with no internals. Or i could by the gun for 350 and then buy a metal reciever and handgaurd separate.

Iv tried to do the math myself however im not certain if iv got the correct internals on my list so the price still may vary.

Is it cheaper to buy the metal kit and then the internals or buy the gun base lever and then replace the nylon hand gaurd and reciver with metal ones? Thanks for the help yall.