5KU 10.3" Aluminium Outer Barrel for M4/AR-15 AEG

Code: 5KU-123
  • Aluminium construction
  • 14mm CCW male threaded tip
  • Fits most M4/AR-15 AEGs

If you're looking for a new outer barrel to change up the length of your M4/AR-15 AEG, the 5KU 10.3" Aluminium Outer Barrel for M4/AR-15 AEG is a fantastic option. Constructed from aluminium with 14mm CCW male threading at the tip, this 10.3-inch outer barrel is styled to match the profile of real 10.3" CQBR barrels and includes pin holes for mounting an M4/AR-15 front sight/gas block at the "carbine length" position. 

The 5KU 10.3" Aluminium Outer Barrel for M4/AR-15 AEG has the standard Tokyo Marui AEG outer barrel fitting at the rear, meaning it should fit the vast majority of M4/AR-15 platform AEGs but won't fit NGRS M4s or GBBRs. Whether you're shortening your barrel to a more CQB-friendly size or giving it a bit more length for more long-range effect, the 5KU 10.3" Aluminium Outer Barrel belongs on your M4 AEG!

Full description



  • Aluminium construction
  • 14mm CCW Male threaded tip - Ready for a 14mm CCW tracer, suppressor or flash hider
  • Realistic barrel profile - Matches real CQBR barrels perfectly
  • Pin holes for M4/AR-15 front sight/gas block - Carbine length gas system
  • Fits most M4/AR-15 AEGs

Package Includes

  • 5KU 10.3" Aluminium Outer Barrel for M4/AR-15 AEG



Parts & Accessories Type
External Parts
External Part Type
Outer Barrel
Package Includes
Metal outer barrel
Patrol Base - Warning Icon
Patrol Base - Warning Icon
Parts Fitting
Patrol Base - Warning Icon
Unique Part
Custom Parts


Colour Wheel Greyscale
Item Colour
Construction Icon

Part Specific

Weapon Platform
Assault Rifle, M4/AR-15 AEG,