What distance is the AK effective to in your opinion Chris? I have 0 experience with AK's and am gleeming what little info I do know from reading. I like the AK platform but keep being told that is not enough rifle.
Not enough rifle for what? An elephant? Even that's arguable.
To me, the AK is a very effective +/- 200 meter rifle all day. Remember, the boiler room doesn't need 2" groups and we are talking SHTF. IMO, the only thing the x51 offers over the x39 is more power, resulting in longer range. Nothing more.

