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Well guys, a 7.63X39 in an AR is about the same.

The "Blackout is standard with a 1-8 twist and the 7.62X39 is standard in a 1-10 twist, so for heavy sub-sonic bullets the blackout would win, but you can put a 1-18 twist .311 barrel in an AR easily and then you'd have all the same abilities of the blackout with the added benefit of inexpensive ammo.

The Black-out is really the same as the 300 Fireball and the 300 Whisper from all practical standpoints. I have made several of them in the years past. I was impressed with them, but not enough to make one for myself.

If I wanted that combination I would probably just re-barrel an AK-47 with a heavier barrel in 1-8 twist and call it good.

The AK can be made to shoot very well with a good quality heavy barrel. The idea that it has "too much moving mass" to be accurate is simply not true. It has a lot less "moving mass" than an M-1 Garand. M-1s can be very accurate.

Also we need to look at the mission statement of a 30 cal 200-220 grain bullet at 1100 FPS. What is that?
What's that for?

If we are honest we'll find that the idea of a sub-MOA sub-sonic 30 cal heavy bullet is not any more useful than a 2-MOA sub-sonic 30 cal heavy bullet.

We are not shooting mice or prairie dogs with that combination are we?
We are shooting bigger heavier targets!
And all would be fairly close. Right?

All would be within the ability of a bullet moving at sub-sonic velocity which means that range has to be known to within about 15 yards.

If you had a 1/2 MOA gun and you misjudged your range by only 5 yards you would be about 1-1.5 inches off the mark anyway with a 220 grain bullet at 1000 fps striking velocity.

So having .5 MOA accuracy is of no advantage to 1.5 MOA in this combination.

Again I point out that a good AK with a good barrel with do 1.5 MOA, and still give you a cheaper rifle with cheaper ammo. Put a quad rail on it and mount a 4X Scout scope and you have all the capabilities of the AR within that mission statement.

I love the AR. So I am not bashing it here.
But I also would choose the 6.8 SPC or the 6.5 Grendel before the blackout. (Or Fireball or Whisper or any other name you want to place on a 30 cal 200-220 grain bullet at 1150 FPS)
It’s just that for shots at 150 yards and less I can see no huge advantage over an AK.
The AR is more “user friendly” in that it locks open on it’s last shot, has a faster mag catch, and an better safety position.
It is more accurate if you have a free float tube installed. That makes a big difference for 300-800 yard shooting. But a sub-sonic 30 is not for 300 yd shooting. Sure! It can be shot at that range.
So can a flintlock rifle.
But neither are really the best choice for such shots.
Again being 100% honest with myself, if I had to choose between a standard 5.56 and ANY tricked out AK or AR in a sub-sonic 30 chambering for shooting anything beyond 150 yards, I’d still just take the 5.56.

Or better yet, I’d go to the 6.8 SPC with a can on it, and beat them both.
But that’s just me
“Your mileage may vary”