Contact Us Tel:(626) 286-0360 Store Locations
NEW Phone Support Hours M-F 7am-6pm PST
Browse by Type or Category
Happy Father's Day! Use code DADD2019 for 20% off! (Sale/MAP items exempt, click for details)

Retro Arms CNC Machined Aluminum Rotary Hop-Up Unit for M4 Series Airsoft AEGs - Red

ID: 59004 (HU-Retro-6388)
6388
Retro Arms638859004
Evike.com
4.1 stars, based on 12 reviews
Retro Arms CNC Machined Aluminum Rotary Hop-Up Unit for M4 Series Airsoft AEGs - Red
Hover or touch above to zoom
May come in black or silver anodized coating, depending on batch
Product image 1 Product image 2 Product image 3 Product image 4
Retro Arms

$35.00

Features:

  • CNC machined construction
  • Rotary design allows for easy adjustment
  • Constructed from EN AW 7075 for extended lifespan
  • All necessary hardware included
  • Bucking not included
Compatibility: Most M4 series Airsoft AEGs
Material: Aluminum alloy

Manufacturer: Retro Arms

12 Customer Reviews

(Write a review)

by Johnson P. on 11/11/2018
"Works great in my Krytac dmr build, I had to remove one of the Krytac hopup springs but itís not a problem at all. I get fairly consistent shots and it works great with the namazu flat hop nub. I have a modify flat hop nub which I had to shave down but plan to replace with a prommy purple. I had two problems, first my mad bull 6.01mm aluminum barrel didnít lock into the unit correctly. I addressed this issue by modifying the stock Krytac hopup clip to fit the unit. My second complaint is that I didnít have the nice red anodizing, my dial and front nut thing are just plain silver. Iím not sure if that is a quality control problem or just a new design but Iím kinda disappointed. Either way I still give this a 10/10 for performance. This unit works better with long range builds.
by David S. on 10/11/2018
"I installed the retro arms hop up chamber in a Krytac CRB. It fit right in without any modifications. It was well machined and seems to adjust just fine. Has alot more precise tuning than the standard krytac hopup unit.

I've had the prowin, VFC, Krytac, Prometheus and the retro arms. Have to say my top two so far for adjustment and fit and finish are Retro Arms and Prometheus. Retro arms is all aluminum as opposed to the Prometheus having some plastic.
by Austin L. on 02/12/2018
"Stupidly good hopup, like other reviews said you will have to trim your bucking but that does not affect performance in the slightest. The grooves inside the turn wheel make it a super solid turn that won't wiggle out of place during use. Also once you screw in the nut for the inner barrel it makes it tight with no wiggle at all. The only thing I had to do was shave my outer barrel a bit to make it fit inside the receiver, but that took two minutes with a file and it was perfect. Beware like other rotary hopups it stands high so it might be to tall for your receiver. All in all it reminds me a lot of the action army hopup for vsr10's in how it operates and once I get this thing out to areas bigger than my local cqb place I'm expecting easy 275ft+ shots on a r-hopped barrel/polarstar setup. 5/5

Questions, Answers and Comments

Discuss about Retro Arms CNC Machined Aluminum Rotary Hop-Up Unit for M4 Series Airsoft AEGs - Red with your friends and fellow Evike.com shoppers!

Comment or answer questions for a chance to win awesome prizes. Details can be found on the Evike.com Facebook page. Remember to check "Also post on Facebook" when commenting to qualify for the giveaways!

Have an urgent question about this item? We monitor these comments daily, but it may be faster to email us directly or call us at (626) 286-0360. Our resident experts are standing by to answer your questions!

California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov