I am planning a 7.62 build instead if my intended 308 build, due to parts availability. I'm finding more 7.62 parts. I've built 13 AR's(5.56, 300, and 6.8). Is there any parts other than the barrel, bolt,and firing pin I need to change from a standard multi call build?i am aware of the pitfalls of this caliber,and issues with the magazines, and crap ammo. I was planing to get a 16" 1:10 chrome lined barrel. Is there any suggestion on any other parts that will help this gun operate properly when done? Ive seen that some companies are offering an entire BCG enhanced for 7.62, but not sure what is special about the carrier, I think all that maters is the bolt. Thanks gents!