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#6194638 - 02/22/16 01:29 PM Gas port size for an AK vs. 300 Black Out vs. 223 Rem?
ChadTRG42 Online   happy
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Registered: 09/16/09
Posts: 10096
Loc: Lewisville, TX
I'm doing some research on subsonic ammo, and I'm trying to find specifications on gas port sizes for the AK-47. I've seen a few numbers, but they are all over the map on different sizes. Is there a standard opening size for certain barrel lengths, or is it common for a large difference in gas port opening sizes on the AK?

I'm showing this so far:

223 Rem in AR-15- gas port .065"-.067"
300 Blk Out gas port- 14.5" barrel= .081" opening, 9" barrel .125" opening
AK-47 opening ???

Any info? Thanks!
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#6194686 - 02/22/16 02:16 PM Re: Gas port size for an AK vs. 300 Black Out vs. 223 Rem? [Re: ChadTRG42]
Classic Rocks Offline
Pro Tracker

Registered: 09/18/12
Posts: 1885
Most any ak is going to be over gassed as evident by the vented gas tube. I am not aware of a "standard" gas port diameter but I am sure there is a recommended range of diameters that companies like I. O. seem to ignore.

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#6194708 - 02/22/16 02:36 PM Re: Gas port size for an AK vs. 300 Black Out vs. 223 Rem? [Re: ChadTRG42]
NTRP Offline


Registered: 02/06/09
Posts: 1421
Loc: McKinney, TX By God!
I think they use whatever drill bit is handy at the time lol
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