Patrol Base Outer Barrel M15/M4/CQB
Patrol Base
Product code: BD0567
  • Extension Piece
  • 14mm CCW Thread
  • Aluminium Construction

An Aluminium constructed outer barrel for M4/M15/M16 Airsoft Electric powered replicas which features a 14mm CCW thread and an extension piece to rapidly adapt between a CQB and Carbine length barrel.

Full description


This Aluminium constructed outer barrel is designed for the M4/M15/M16 family of Airsoft Electric Guns, and comes included with a short extension piece to convert your outer barrel from a CQB length (10.5") to Carbine length (14.5"). Both barrel pieces feature a 14mm CCW thread at the end so that you can still install your favourite muzzle devices such as suppressors and tracer units, regardless of which length of barrel you currently run. The outer barrel also features grooves at the front for the installation of an A-Frame front sight.


  • Aluminium construction
  • Removable extension piece
  • 14mm CCW thread
  • Grub screw secured
  • Ridges for A-Frame
  • Matte black finish
  • Quickly change barrel length

Package Includes:

  • Outer Barrel M15/M4/CQB



External Part Type
Outer Barrel


Colour Wheel Greyscale
Item Colour
Construction Icon

Weight and Dimension

Product Length
Approx. 38cm
Weight KG Icon
Weight (KG)
Approx. 0.19kg

Part Specific

Weapon Platform
AR Platform, M4 / AR15 / M16,

Suppressor Specific

Icon Thread Direction
Outer Barrel Thread Direction
CCW (Counter Clockwise)
Outer Barrel Thread Size
Icon Thread Type
Outer Barrel Thread Type

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.