FPS Softair Polymer Piston w/Steel Tooth Rack for Marui NGRS M4

Code: PM05
  • High strength, low weight
  • Polymer body and metal teeth
  • For TM NGRS M4 variants only

FPS Softair brings you a super high quality M4 piston with a technopolymer body and a full rack of steel teeth for a good combination of high strength and low weight. This is compatible with Tokyo Marui NGRS M4 gearboxes, aka the Version 9 gearbox. Please note, this piston is not compatible with the TM NGRS SCAR-L or SCAR-H. 

The loaded technopolymer assures great mechanical resistance and dimensional precision. The rack was manufactured through the use of MIM (Metal Injection Moulding) technology since this production process guarantees dimensional accuracy and sturdiness equal to those of solid machining.

Currently considered the best for this type of use, the metal injected is SAE 4650 steel. The sliding guides are designed to minimize friction and hold the lubricant for a long period of time, so you can be safe in the knowledge that your AEG will have reliable and long-lasting cycle functionality.

Full description



  • Improves reliability and lifespan
  • High strength, low weight
  • Polymer body and steel teeth
  • For TM NGRS M4 Gearbox (M4, MK18, 416 etc)
  • NOT compatible with NGRS SCAR-L or SCAR-H

Package Includes

  • FPS Softair Polymer Piston w/Steel Tooth Rack for Marui NGRS M4



Internal Part Type
Patrol Base - Warning Icon
Patrol Base - Warning Icon
Parts Fitting

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.017kg
Product Height
Approx. 2cm
Product Length
Approx. 6.8cm
Product Width
Approx. 2cm


Colour Wheel Greyscale
Item Colour
Black, Green,
Construction Icon
Polymer with steel teeth
Internal Part Construction
Polymer, Steel,

Part Specific

Part for Power Source Type
Weapon Platform
  • AR Platform
  • M4 / AR-15 / M16
  • Long Gun
  • Assault Rifle
Package Includes

Electric Part Specific

Gearbox Icon
Gearbox Version
V2 Gearbox
Gearbox Version Compatibility Variant
Version 2

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.