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Retro Arms CNC Machined Aluminum Hop-Up Unit for AK Series Airsoft AEGs - Red

ID: 58998 (HU-Retro-6564)
Retro Arms656458998
4.4 stars, based on 5 reviews
Retro Arms CNC Machined Aluminum Hop-Up Unit for AK Series Airsoft AEGs - Red
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Retro Arms



  • CNC machined construction
  • Striking red anodized finish
  • Constructed from EN AW 7075 for extended lifespan
  • All required hardware included
Compatibility: Most AK series Airsoft AEGs
Material: Aluminum alloy

Manufacturer: Retro Arms

5 Customer Reviews

(Write a review)

by Robins M. on 06/29/2019
"Bought this for my e&l ak 74 gen 2. It fits perfectly and has a more consistent reliable hop than the stock hop up. It also does not flex or bend no matter how cold or hot the tempreture is. Highly recommended.
by Max S. on 12/21/2018
"I bought this unit for my CYMA Stamped Steel AK-74m VFC Clone model CM.040.
by Max S. on 12/21/2018
"Took a chance on one of these hop-up units and the RetroArms magazine cube for the mag well. Great combo.

To start, this hop-up unit is designed to screw into the mag well cube underneath and the front top screw hole in your gearbox shell. This creates a tight fit with no gaps or wobble. I like the design, it's innovative, but It will not fit your stock CYMA gearbox right out of the box. With some slight filing it can though and it is worth it. To be fair It's designed for the RetroArms CNC gearbox shell, but since my stock CYMA gearbox shell is still fine I decided to make this work.

Do not file down the hop-up unit. Instead hold the unit up to the top most forward screw hole mount in you gearbox shell the one just above the nozzle and take note of how much metal you need to remove to make the hop-up slide over the screw hole. Then it's best to take your gearbox and shell apart to do the filing so you don't nick your nozzle, but I cheated and unscrewed it enough that i could pry it open and lift the shell away enough from the nozzle as to not damage it while I ran my file carefully and flatly over the screw holes till I had removed enough material that the hop-up unit would fit and screw to the gearbox shell with the provided longer hex screw.

This unit also clamps onto the barrel nicely as well with a split threaded washer which eliminates any chance of the barrel rolling or wobbling during shots. All together I am now getting the best and most accurate shots I have ever gotten, well worth the work. I recommend this unit even at this price and the work it took to fit it just for the results at the end. Together with the RetroArms mag well cube these have been the best two investments I've made in my Ak.

10/10 would buy again if needed.

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