Contact Us (626) 286-0360 Walk-In Superstore Daily Deal
New Phone Support Hours M-F 8am-5pm PST
Browse by Type or Category
PRESIDENT'S DAY SALE - 22% OFF (exclusions apply, see details)   Use code: PRES2017

Matrix CNC Aluminum Hopup Chamber for AK Series Airsoft AEG Rifles

1 Customer Review

by Christopher B. on 11/11/2015
"I just installed this hopup in my JG AK74. The picture shows two different models; not sure why. The one I received was the blue one. I kept the parts/pieces from the original hopup as this unit came w/ none.
It was necessary to do some minor modifications to the unit and my gun to get everything to work. Almost anybody could do this.
Where the motor housing and the hopup come together, there is a tab with a screw through it. This tab goes in between the upright portion of this hopup. This was not how the original polymer hopup was installed as it did not have this feature on it. This tab is a little too wide to go between the upright portion. I removed the screw from the tab, lightly filed down both sides (this was easy as the housing is pot metal) and then slid the hopup around the tab and reinstalled the screw.
Next was the pin that is installed w/ the hopup lever. The hole for the pin in the Matrix unit is slightly tighter than the original. The original pin would not fit. I had to find the right drill bit size to open the hole up so the pin would insert but still remain tight enough.
Lastly, the profile of the pickup tube on the bottom of the unit for the BB's is slightly different to the point that none of my mags would lock in. Not even close to locking in. It appears the profile is constructed heavier/thicker on the Matrix so it doesn't push the button inside the mag at quite the right spot to make it all slide together. Easy fix. I used a Dremmel (could've used a fine toothed file too) to lightly reduce the profile a little bit on the back side of the hopup's BB pickup opening. This right where the hopup and the button inside the mag meet. By lightly filing this back side, all my (various) brands of mags work seemlessly. I used a very fine grit with the Dremmel and it came out very smooth. I didn't want any rough spots chewing on my mags.
So that's it. The Matrix hopup, a Prometheus barrel, and a new bucking later and my gun is back in the game and performing (accuracy and distance) way better than it was new, out of the box. No duh, right?
I hope this helps anyone thinking about this unit or having an issue w/ installation. And the the people at Evike have been top notch in helping me get the parts I needed and resolving some issues. Just talk to them. They'll get you steered in the right direction.