Well since my m4 build has been figured out I am planning out my next build. I want it to be a long range weapon. I am going to design it after the mk11 mod 0 or m110. I cant seem to find a 7.62 knights lower so I am wondering which lower to use. I am also wondering if the kac URX will fit most uppers? I will most likely use a magpul 308 stock vs the standard a2 or a2 adjustable. I like the LOP and cheek adjustments.