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Old 12-24-2013, 07:56 PM   #1
CzechThisOut
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Default Adjustable Gas Block?

I found this - an adjustable gas block for an AK

http://www.copesdistributing.com/adj...de-p-1335.html

My first thought was "what the heck?".

Is there ANY reason for this? They state it:

reduces recoil
reduces damage to receiver rails and rivets in the rear trunion and rails
Bolt carrier racking is reduced
Minimizes carbon build-up on the piston head and shaft
Enhances bullet velocity by using less gas to cycle the system
Adjustments -off position for single shots to a full gas position for any load available

Reduces damage to receiver rails? I never knew that problem existed...

What do you think?
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Old 12-24-2013, 08:04 PM   #2
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Just another gimmick. Why fix something that isn't broke
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Old 12-24-2013, 08:15 PM   #3
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These were often used on PSL rifles to control the gas pressure for firing heavy ball ammunition.

Some are in posts in the ROMAK III section etc.
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Old 12-25-2013, 01:14 AM   #4
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you can do the same thing with a drill, tap and a set screw
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Old 12-28-2013, 04:47 AM   #5
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Quote:
Originally Posted by sleepyrz View Post
you can do the same thing with a drill, tap and a set screw
Anyone documented how they did this modification? I have a 74 that is over gassed and this is a better option than re welding the port and redrilling.
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Old 12-28-2013, 04:58 AM   #6
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tap the existing hole for a socket head allen screw and drill a smaller hole than original in it and work your way bigger until it cycles properly. that would be my guess......
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Old 12-28-2013, 10:58 AM   #7
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Quote:
Originally Posted by LOZ6Hrs View Post
Anyone documented how they did this modification? I have a 74 that is over gassed and this is a better option than re welding the port and redrilling.
search function>

http://www.akfiles.com/forums/showth...screw+gas+port
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Old 12-29-2013, 09:58 AM   #8
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Quote:
Originally Posted by AKBLUE View Post
Thank you for the link Akblue - I had visualized a screw, with a groove or a hole perpendicular to the length in the middle, horizontally intersecting the gas port assembly hole. That way you could turn the screw and adjust the gas ,or shut it off, based on the position you've turned the screw.
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Old 12-29-2013, 10:12 AM   #9
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Quote:
Originally Posted by sleepyrz View Post
you can do the same thing with a drill, tap and a set screw
That method works as a restrictor but not really a adjustable type gas valve.

The adjustable allows different weight bullets and load types etc.
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Old 12-29-2013, 11:16 AM   #10
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If I'm going to do a fix, seems like adjustable would be the route to go. Not sure if the gasses would be hot enough to degrade the threads of the "cross" bolt type regulator. I don't think so. The piece that would have to be worked out would be locking the "regulator" position. Also, have to keep profile low so it would not create opportunities to snag things when carried.
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Old 12-29-2013, 11:28 AM   #11
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Quote:
Originally Posted by LOZ6Hrs View Post
If I'm going to do a fix, seems like adjustable would be the route to go. Not sure if the gasses would be hot enough to degrade the threads of the "cross" bolt type regulator. I don't think so. The piece that would have to be worked out would be locking the "regulator" position. Also, have to keep profile low so it would not create opportunities to snag things when carried.
A search here and Google will bring up several variations on adjustable gas blocks. Some are modified Yugo grenade block type and others a different design.
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Old 12-29-2013, 11:40 AM   #12
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yugo M76 if your running a heavy barrel

the yugo M70 grenade mod done by a member us pretty ingenious for standard AK's, but not necessary.
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Old 12-29-2013, 11:46 AM   #13
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Quote:
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yugo M76 if your running a heavy barrel

the yugo M70 grenade mod done by a member us pretty ingenious for standard AK's, but not necessary.
M76 is a very limited application size wise. Large journal., valve not standard to AKM gas tube etc. Can work but limited use without some fairly big mods.
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Old 12-30-2013, 01:33 PM   #14
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i have one on my PSL but its hard to press on and it is hard to adjust-plus no way to set it its just a big fine threaded bolt with a lock nut.
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Old 12-30-2013, 06:22 PM   #15
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Default The easy fix is to sell the rifle as is.

Quote:
Originally Posted by LOZ6Hrs View Post
Anyone documented how they did this modification? I have a 74 that is over gassed and this is a better option than re welding the port and redrilling.
The 74 uses a 90* gas block that makes it impossible to drill and tap for a jet setscrew without removing it.

The smoothest shooting 74 that I had experience with was a Romanian, 22lr shooting is about the same. Sort of like shooting a AR. They came with a PSL look alike stock.

I had a Saiga in 5.45x39 with the same problem and regretfully sold it.

To do the set screw mod on a 74 you will need to remove the front sight assembly to get the gas block out. Then drill and tap for the set screw with the correct orifice. You will need to find out the correct size for the set screw orifice. Then reassemble the gas block and test.

If it works good you are done and re install the front sight assembly.

If not, you will have to remove the gas block and drill the setscrew larger or swap in a smaller orifice one.

The Saiga I had was the newer ones with the dimpled gas block assembly instead of the pins, this ones require a pinned on gas block replacement and a little more work drilling the dimples to make removal easier.
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Old 12-31-2013, 01:04 AM   #16
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Got it Jaime. May buy a spare gas block to experiment with an adjustable gb and have the original to do the set screw mod if my adjustable fails. Appreciate the input of everyone that responded.
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Old 01-17-2014, 10:10 AM   #17
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i was referring to the method where the set screw is used as an adjustable valve

you drill from the side and turning the set screw in or out opens and closes off the port to some degree

not the method where the set screw is inside the gas block port hole itself and then drilled to a set size
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Old 04-20-2014, 09:16 PM   #18
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I am having issues with a 74 kit I built into a 5.56. Did you modify your gas block yet?
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