300 Blackout Ak rifle.

[Hallow]

I have been researching the subject of a 300 Blackout Ak rifle(16-1/2" barrel). I know this his been done in 300Blk & .556 using Ak74 parts.
What would be a good starting point for a gas port & size to cycle cast 200gr+ subsonics?
I know this is normally an Ar15 forum but figure there is enough knowledge to figure this out.

[smustian]

Might have better luck going to ARFcom and look in the Variant section.

[John A.]

Pretty sure that a normal AK gas port diameter is ~ .128.

My blackout gas port on my 8.5" 300 blk barrel is .125".

I have serious doubts that some of my sub loads would cycle an AK due to the piston and how AK's work in general.

[Hallow]

http://www.thefirearmblog.com/blog/2011 ... 0-aac-blk/

[Hallow]

Review this article, it has been done. Surely someone here has done something similiar.

[Flatliner]

Largely for the purposes of education, why would someone not simply load 7.62x39 heavy subsonics? Is it a bullet availability issue?

[jlwilliams]

Silvers built one and did a thread on silencertalk back before he started this forum. It's probably still archived there.

[certifiable]

My VZ58 has a 0.109" gas port and will cycle 180gr subs and achieve BHO w/o a can.
My 16" Arsenal will cycle them as well but I haven't measured the port size
My WASR had a 0.147" port but I never tested the subs before I chopped it up
Hope this helps you out

ETA
Compared my 180gr sub data for 300 & x39 and both are running nearly equal charges of the same powder