Got cha. not super familiar with what it takes to do 6.5 swap. The upper and lower will fit (as in the pins will lock in) but you may need to swap a couple things internally like the buffer and your mag followers to make it function properly but besides that you should be good (of course do research and verify). this is one reason the 300 Black Out got some of its popularity, its literally JUST the barrel, everything else is same same.
Good luck man!