Protech Airsoft

Protech Mk2.5 M4 HPA Kit V2 Engine

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Your Price $300.00



  • Manufacturer: Protech Airsoft
  • Model: Mk2.5 M4 HPA Kit V2 Engine
  • SKU: PT-MK2-V2-M4
  • FPS: 250-650fps w/.2g BB – Dependent upon setup
  • Rate of Fire: Adjustable 1 - 30+ RPS
  • Fire Modes: Semi, Full Auto
  • Max Operating PSI: 35-125 PSI
  • FCU Voltage Range: 6-8.4v – 2s Lipo should be used. 3 Cell and NImh/Nicd may cause damage to electronics 
  • Proudly Engineered & Manufactured in the USA
  • Patent Pending AirBrake™ Nozzle System loads each bb at a controlled speed with low force, solving the issue other rear biased nozzle HPA systems not feeding with many hopup and bucking configurations
  • Fits into most Center-line nozzle AEG’s with little to no modification
  • Upgrade Kits from MkII to Mk2.5 available from retailers
  • 14 + Nozzles available standard & more coming Q2 2017
  • Custom Nozzles & Wire harnesses available standard
  • UFCU Control system uses easy visual programming with an LCD and 5 -way Joystick
  • 3+ Month battery life in standby on a 2s 250mah LipO
  • 3 Local Profiles able to be stored directly on FCU, no need for Bluetooth profile storage for each of your configurations
  • Best value of any drop-in HPA system on the Market 
  • Made in the U.S.A.

Package Includes:

  • 1x Protech Mk2.5 M4 HPA Kit V2 Engine
  • 1x UFCU Fire Control System
  • 1x Wire Harness
  • 1x Trigger Board
  • 1x Buffer retainer screw
  • 1x Airline with 1/8 UNI male termination


  • 3year Manufacturer defect on mechanical components
  • 1year Manufacturer defect on electrical components
  • O-Rings and Seals, wear and tear, and abuse not warrantied
  • Warranty claims within the US must be filed directly with Protech Airsoft via their website:

** The Protech Mk2.5 M4 HPA Kit V2 Engine is a low manintenance and more advanced than you typical AEG gearbox. This is a drop in kit that requires professional installation and additional equipment to function properly. You will need to have an AEG, HPA Regulator, and HPA tank to make the whole system work. All these are available her at or at our walk-in store.

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