ASG Ultimate Upgrade M15/M16 Hop-Up Unit

Code: 16635
  • Perfect Upgrade
  • Alloy Hop-Up Unit
  • No Loose Movement

A replacement Hop-Up Unit for Airsoft M4 / AR-15 / M16 Rifles, designed and constructed to high standards by Action Sports Games in Denmark as part of their Ultimate Upgrade Parts Range. 

Full description


The Hop-Up unit is constructed from Alloy to reduce flexing over traditional Polymer Hop-Up Units and features Polymer Wheel Cogs and Retaining Clips. A great upgrade for Stock Airsoft M4 / AR-15 / M16 Rifle when used in combination with a new Hop-Up Bucking and Barrel Set. This is a perfect purchase for those Airsoft Skirmishers looking to bring their project guns back to life, or for those with little tech knowledge who are also looking to upgrade their weapons.


  • Part of Action Sport Games Ultimate Upgrade Parts Range
  • Comes with all necessary Cogs, Screws, Springs and Retainer Clips
  • Less Flex than traditional Polymer Hop-Up Units
  • Great upgrade for Stock Airsoft M4 / AR-15 / M16 Rifle
  • Hard to turn gears, great as your hop will stay set all day long

Package Includes:

  • Ultimate Upgrade M15/M16 Hop-Up Unit

Special Instructions:

Please note that this Hop-Up chamber does not come with the Hop Rubber and Bucking, and can be purchased separately.



Internal Part Type
Hop-Up Unit


Colour Wheel Greyscale
Item Colour
Construction Icon
Alloy body with polymer adjuster cogs

Part Specific

Part for Power Source Type
Weapon Platform
M4 / AR15 / M16

Electric Part Specific

Gearbox Icon
Gearbox Version
V2 Gearbox

Size guide

Parts Fitting

Upgrades and Downgrades should only be undertaken by experienced players, or Airsoft Technicians. Please note, changing any internal parts of a weapon voids its warranty unless done in-house by our staff. 

Please ensure that when fitting parts the part purchased is the correct part, as once a part has been fitted we cannot accept return.

We do know that players love to tinker, so we're here to give you help should you require it, and if needed you can get in touch with our workshop for more help!

Unique Parts

Please note that some parts may be unique to a specific brand of weapon. For example: Parts for an ASG M4A1 may not fit an ICS M4A1.

Parts from the same brand typically have a high chance of fitting, though be warned, some replicas use unique parts, so please ensure the part will fit before you attempt to fit it.

If you require help with fitting any parts feel free to get in touch with us via our Contact Us Page.

Need ideas for something extra?