Airtech Studios BEU Battery Extension Unit for ARP-9 / 556
Airtech Studios
Product code:
  • Drop In Upgrade
  • For Large Batteries
  • Extra Storage Space

A battery compartment extender designed to fit the G&G ARP-9 which allows the use of a wider range of larger batteries.

Full description


The case is constructed from thick Polymer and clips directly onto the existing battery storage compartment as a simple drop in upgrade, and features walls which match the thickness of the existing battery compartment to increase its resistant to Shock and Impact Damage. The sides of the Box allow for the use of the Sliding Stock, and caters for larger sized batteries. This is the perfect purchase for any Airsoft Skirmisher who owns an G&G ARP-9 and always wanted to use larger batteries.


  • Drop In Upgrade for the ARP-9
  • Clips on to the back of the ARP-9 Battery Compartment
  • Designed to utilise larger batteries
  • Tough Polymer Design to withstand Shock and Impact
  • Extra Storage Space for Batteries
  • Still allows the use of the ARP-9 Sliding Stock
  • Lines up perfectly with the ARP-9 Body
  • Protect the ARP-9's Wiring & Components
  • Reduce the build up of heat

Package Includes:

  • BEU Battery Extension Unit for ARP-9 / 556



External Part Type
Stock Adaptor


Colour Wheel Greyscale
Item Colour
Construction Icon
All Polymer construction

Weight and Dimension

Product Height
Approx. 4.5cm
Product Length
Approx. 5.5cm
Product Width
Approx. 5cm
Weight KG Icon
Weight (KG)
Approx. 0.25kg

Part Specific

Weapon Platform
AR 9mm, ARP -9,

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.