- 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.
Here at Patrol Base we ship all around world, with delivery not only to the UK, but to most of the EU and select Worldwide locations as well. We provide a working day by road service via our handpicked courier services, simply buy your Airsoft guns with us and we'll have them delivered directly to your door.
For more information and to see the country we deliver please check out our Delivery Information Page.
Below are some rough postage prices for orders. Please note these are subject to change, and are only a rough guide. For more accurate postage estimate please use the Postage Calculator at the basket.
UK Next Day
Highlands / Islands
* Please note that Scottish Highlands, Islands and EU post prices can vary wildly. Prices range from £8.99, up to £29.99, so please ensure you refer to the Postage Calculator at the basket for the lowest possible price.
We want you to be absolutely happy with our products and services, so we provide the simple Patrol Base guarantee: if on receiving your item you are unhappy with your item for any reason then simply send it back to us. We will replace or refund the item.
You can return any item for any reason whatsoever, even if you have just changed your mind, within 14 days of receipt of the order. This is in addition to your rights under the Consumer Protection (Distance Selling) Regulations 2000.
For more information on returning products, and how to do it please visit our Returns Policy Page.
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
- Ultimate Upgrade M15/M16 Hop-Up Unit
Please note that this Hop-Up chamber does not come with the Hop Rubber and Bucking, and can be purchased separately.
Internal Part Type
Alloy body with polymer adjuster cogs
Part for Power Source Type
M4 / AR15 / M16
Electric Part Specific
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!
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.
For more information with fitting parts, or should you require help, feel free to get in touch with our Workshop Department via our Contact Us Page.