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ProWin / Dytac CNC Hopup Chamber for M4/M16 Series Airsoft AEG Rifles

ID: 40058 (HU-PW-M4)
DY-AP25 / PW-Chamber-M4
DYTAC859188400580DY-AP25 / PW-Chamber-M440058
4.0 stars, based on 49 reviews
ProWin / Dytac CNC Hopup Chamber for M4/M16 Series Airsoft AEG Rifles
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MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.


  • High performance M4 hopup unit.
  • CNC out of aircraft grade aluminum.
  • Superb air seal.
  • Superb durability.
  • Anodized surface treatment.

Manufacturer: ProWin


Compatibility: For Matrix, Tokyo Marui and other compatible M4 / M16 Series Airsoft AEG Rifles
Material: CNC Aluminum


The DYTAC team has over a decade of experience in Airsoft manufacturing and computer assisted product development and design.We keep up to date with real firearms development and knowledge, and understand how real firearms and Airsoft function to form a sophisticated knowledge pool for our brand. We also understand the purposes, capabilities and limitations between real firearms and Airsoft, and our design reflects upon this understanding by merging the functions suitable for use on a real firearm in Airsoft, at the same time complimenting the internal functions of an Airsoft gun or accessory.

49 Customer Reviews

(Write a review)

by Kevin S. on 08/20/2021
"Great Hop-Up Unit
Fits into Specna Arms Edge and Arcturus M4s
does not include nub or bucking so keep that in mind
No clicks on hop up wheel but has quite the amount of friction to keep it from undialing itself.
by Bradyn K. on 09/30/2020
"Great unit for a great price. Bought this for my CYMA m4 and paired it with a promy tight bore barrel and a modify hard flat hop up bucking and flat nub. gun shoots way more consistently now. fps is more stable being roughly 393-403. air seal is better and works great with the other stuff i got. adjusting the hopup is also way better than the stock unit, fine adjustments are much easier to do. Great quality product and would definitely recommend, especially if you're on a budget. Also looks are pretty nice, love pulling back the bolt just to see my shiny new unit!
by Gabriel L. on 08/07/2020
"I have used 3 or 4 different hop ups before i tried this one and i can say that this unit is seriously the best. What i mean is that its consistent, it handles high FPS guns well, doesn't fall out of adjustment easily and grabs the magazine every time. For what there asking for it in price is very worth the money. I paired it with a mad bull 6.03 barrel and it makes a 120 dollar gun shoot like a 300 dollar gun. Simple upgrades go far if you put the money were it counts.

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