GHK AKM GBBR Review

[Kokanee]

A note on the PROWIN CnC chamber; I received mine but it was completely out of spec; waaayyyyy too large to fit where it needed to. Despite more than an hour of careful filing on my part, I was unable to get it to fit inside without hammering on it, and that began to deform it so I gave up.

I am sticking with the stock chamber and PROWIN CnC nozzle which is shooting right at 415fps right now so it's perfect for my region's velocity limits.

PROWIN really, really needs to make a standard CnC nozzle vs just the high flow one, especially as it seems there magazines cause massive stoppages in the rifle unless you have their nozzle installed as well.

[turok_t]

I have tried installing 4 prowin CNC hop up chambers into 4 GHK AK's. Three of them were a drop in fit and didn't need filing/modifications, one of them had to be filed down at the wings were it slides down the gun. After the filing, it fitted perfectly.

On another note, Ive installed the Hephaetus steel valve knocker on both of my GHK AK's. Ive noticed that on the stock valve knocker, it was all polished and silver, might be due to the wear when the magazine was inserted in the magwell and the blowoff valve hits the bottom of the valve knocker on impact. After installing the Hephaetus valve knocker, it seems to be doing great. The only issue was the burs around the cylinders of the valve knocker (these cylinders move along the curved part of the hammer). The burs I noted causes the valve knocker to raise up (as opposed to being pulled back) when the hammer cocks. As such, the burs around the cylinders need to be filed/removed. After that, it glides freely back and forth in relation with the hammer. Ever Hephaetus valve knocker may have burs in different location around the cylinders, just grind the ones that interfere with the hammer and you're good to go.

Here is the Hephaetus valve knocker:


Here is a picture comparing the stock vs Hephaetus valve knocker:


Closer picture of the burs causes the valve knocker to be raised up when the hammer cocks:



Going to be trying the Action cylinder floating valves to see if they make a difference. Too bad, I can't figure out how to pull the nozzle apart after removing those two damn pins:

[GBBR]

I have a GHK AK105, the samoon guys are just a pleasure to work with in.

Anyways my only problem with the rifle is that the trigger pull feels almost as light as an AEG's trigger pull

It feels disgusting, so much so that I don't use that rifle,

[Kokanee]

Originally Posted by turok_t

I have tried installing 4 prowin CNC hop up chambers into 4 GHK AK's. Three of them were a drop in fit and didn't need filing/modifications, one of them had to be filed down at the wings were it slides down the gun. After the filing, it fitted perfectly.

I must have gotten a lemon then; it happens I suppose!

Originally Posted by turok_t

Going to be trying the Action cylinder floating valves to see if they make a difference. Too bad, I can't figure out how to pull the nozzle apart after removing those two damn pins:

Are you referring to the stock nozzle or PROWIN nozzle?

[turok_t]

Stock nozzle... It feels like the two halves are glued together

[Kokanee]

Yeah there is no way you are getting that apart, I've tried. (Although I welcome being proved wrong).

[Latvian291]

Does anyone know where to get an NPAS for these rifles? I am running Co2 and I've been told the fps is generally higher. I mistakenly bought the NPAS on WGC thinking it would work but it is for the AKS-74U.

[Kokanee]

No NPAS that I know of, but Samoon has a "1 joule" nozzle (with propane), I would presume that you would get higher but acceptable fps out of it if you installed it and ran it with c02

[pum]

Thanks Kokanee and Turok_t for the response.
I ended up getting the steel barrel, blowback kit, and the high velocity nozzle.

I do encounter the same problem with Diwasas with the nozzle leg broken off. The stock one that came with the gun broke after couple magazine as well. And the upgraded nozzle broke off , but I didnt realize the legs broke off after shooting about 8 magazines in.Did anyone figured a way to get around this? (sorry if there's already an answer to it, but I am not 100% familiar with parts discussed above.)

thanks,
herb

[Latvian291]

Originally Posted by Kokanee

No NPAS that I know of, but Samoon has a "1 joule" nozzle (with propane), I would presume that you would get higher but acceptable fps out of it if you installed it and ran it with c02

I ended up buying this:

http://fg-airsoft.com/fr/pieces-pour...r-ghk-pdw.html

[Kokanee]

How does it perform? Would be very interested to hear from someone firsthand about this nozzle.

[Latvian291]

Originally Posted by Kokanee

How does it perform? Would be very interested to hear from someone firsthand about this nozzle.

Can't tell you yet. It is going to ship mid-month.

[pum]

Latvian291: Is the body made out of the same plastic material?
The item description wasnt clear about which part being polymer or metal.


To update what happened to the nozzle after firing 1 1/2 magazine more on the broken legs nozzle.

[Latvian291]

Originally Posted by pum

Latvian291: Is the body made out of the same plastic material?
The item description wasnt clear about which part being polymer or metal.

You're right; the description leaves a lot to be desired.. I will tell you when I get it.

[pum]

Sweet, looking forward to hear about the test result.