Action Army Tokyo Marui M40A5 Power Spring

Action Army
  • Enhanced FPS
  • High Quality Spring
  • Marui M40A5 Compatible

A spring designed and manufactured by Action Army for Tokyo Marui's M40A5 spring Airsoft sniper rifle. The spring is one of, if not the most important internal component of Airsoft bolt action sniper rifles, and if you're looking to enhance the performance of your sniper, changing the spring is one of the first things you should look at.

Full description


This replacement spring will allow you to up your M40's performance to approximately 420FPS. Finely manufactured and finished, this spring is designed to allow you to get the best possible efficiency and performance from your rifle's bolt, with an incredibly smooth flowing action. If you're looking to enhance your FPS, then this easy to install, purpose-designed Marui M40A5 Spring is an excellent choice to start.


  • Designed for the Tokyo Marui M40A5 spring series
  • Enhanced FPS Upgrade Spring
  • Excellent coil strength
  • Closed and Flat top and end for improved stability
  • Flattened Ground In Cut Ends to prevent wear from scratching

Package Includes:

  • Tokyo Marui M40A5 Power Spring - M130

Special Instructions:

Please note, the end result of your rifles FPS is determined by many other components not just inside your Cylinder but also the Barrel Length / Bore, Hop-Up unit, BB weight, Air Seal and much more. Any ratings above are an average found from testing by the manufacturer, and are a rough guide to their power.

Before fitting the Spring please compare you existing spring with the measurements in the Size Section of the product description to ensure compatibility with your Spring Guide, Piston and Cylinder Setup.

If you are unsure on fitting this spring and what to expect from doing so, please feel free to contact our Workshop Team either via email at: or call our team on: 01484 644709.



Internal Part Type
Patrol Base - Warning Icon
Upgrade Parts
AA - Marui M40A5 Spring M130
Name Variant
M130, M150,

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.05kg
Product Length
Approx. 15.1cm
Product Width
Approx. 1.12cm


Colour Wheel Greyscale
Item Colour
Gun Metal Grey
Construction Icon
Internal Part Construction

Part Specific

Part for Power Source Type
Weapon Platform
Package Includes
Main Spring

Spring Specific

Spring Approximate M/S
Approx. 130m/s, using 0.20g BB
Spring Approximate FPS
Approx. 426fps, using 0.20g BB

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.