WE MP5 to M4 AEG HPA Adapter - 2026 Edition - PLUG AND PLAY (Copy)

£89.99

Free Lifetime Warranty against manufacturing defects and accidental damage. Tap to learn more
Quantity:
In stock

Love your WE GBBR MP5? Hate gassing out and low capacity? Use M4 AEG mags instead!

Well we’ve reverse engineered & manufactured our own short magazine, then added an MP5 magwell for the perfect skirmish build. 

Plug and Play - This adapter comes with feed lip, gas router and valve prefitted so you don't need to take parts from a donor mag!

DO NOT EXCEED 150PSI WITH ANY AIRSOFT HPA ADAPTER.
ALWAYS USE AIR REGULATED BY A SECONDARY REGULATOR (EG AT200, WOLVERINE STORM, POLARSTAR MRS).
CHECK YOUR PSI BEFORE CONNECTING AIR TO A HPA ADAPTER.
NEVER CONNECT OUR EQUIPMENT TO PAINTBALL AIR TANKS OR CO2 TANKS.
NEVER CONNECT OUR EQUIPMENT TO A TIPPMAN STYLE HPA LINE

Plug and Play

This adapter is ready to go out of the box. Valve, feed lips, and gas router are already fitted to the adapter. You do not need to use any donor parts.
No assembly is required.

M4 Adapter Information

  • Injection moulded from polycarbonate, this magwell is near indestructible!
  • Compatible with most airsoft M4 magazines.
    • We recommend EPM1/EPM1s magazines as they have excellent fitment and strong springs.
    • Magazines advertised as Fast Feed such as the original EPM or Amarok magazines will also work well
  • BB retention means only 2-3 BBs are dropped when changing mag
  • A swappable rear shim is included

Key Information

  • We use a US Foster Fitting as standard. This is the most common airsoft HPA fitting. EU fittings can be purchased separately.
  • Some of our HPA adapters have a smaller internal volume than gas magazines. Because of this, you will need to use a PSI of 90–150.
  • If you need higher FPS, you can:
    • Fit a tighter barrel
    • Use a longer barrel
    • Use heavier BBs
    • Fit an improved hop bucking
  • If your replica has an NPAS fitted, we advise opening it fully.
  • Do not exceed 150 PSI. Many airsoft guns will not see an increase in FPS past this, as the hammer may struggle to depress the valve correctly.
  • Insert the HPA adapter with your bolt / slide locked back to minimise pressure against the nozzle loading arm.

AIRTAC Adapters

Each of our adapters is designed to be low profile while reaching field limit FPS. We design and manufacture all of our products to the highest standard, and do not charge extra for ‘premium’ features. Where applicable this adapter features:
  • Lifetime Warranty (Our adapters have to be built to last)
  • Injection moulded or CNC magwell that is impervious to BB strikes at point blank skirmish FPS.
  • CNC or Injection moulded Feed Tubes and Magazine Catches for lifelong durability.
  • Tuneability/compatability via integrated shim systems. Our adapters are designed to cope with 'airsoft tolerances'
  • Gas Routers injection moulded from NBR, 1:1 with the factory gas router.
We test every HPA adapter we sell
  • Seal Test
  • Firing test, for feed and recoil (we have over 100 guns on site for testing)
 

Run different mags with your adapter!

This adapter is also compatible with the following modular magwells:
Magazine Type Compatibility
M4 ✅ Compatible
M4 (Angled) ❌ Not compatible
MP5 ✅ Compatible
Shotshell (Pistol Style) ✅ Compatible
Shotshell (Rifle Style) ❌ Not compatible
Remote Feed ✅ Compatible
Compact Drum ✅ Compatible
DO NOT EXCEED 150PSI WITH ANY AIRSOFT HPA ADAPTER. ALWAYS USE AIR REGULATED BY A SECONDARY REGULATOR (EG AT200, WOLVERINE STORM, POLARSTAR MRS). CHECK YOUR PSI BEFORE CONNECTING AIR TO A HPA ADAPTER. NEVER CONNECT OUR EQUIPMENT TO PAINTBALL AIR TANKS OR CO2 TANKS. NEVER CONNECT OUR EQUIPMENT TO A TIPPMAN STYLE HPA LINE