M4A1 Assault Rifle is the Carbine version of the M16A2 Rifle which with 80% parts commonality. It has a 14.5 inch barrel, allowing its user to better operate in CQC (Close Quarters Combat). It is heavily used by the US Military and slated to eventually replaced the M16 rifle for most combat units in US army.

WE KATANA M4A1 AEG is the new tactical rifle in WE AEG Series which comes in a new designed KATANA Split gear box system. The KATANA AEG system comes with a changeable cylinder unit and the new designed gear box in the lower frame. It will comes with 3 types of cylinder unit (300 / 400 / 450 FPS) and the 400 FPS cylinder is the standard eqippment with the KATANA AEG. Although the gear box is special made, it can compatible with most of the parts of  ver 2 gear box (gear set, selector plate and motor). When user need to change the cylinder unit, please ensure the selector is in “Safe” before changing. 

Also, the hop up system and inner barrel is compatible with TM M4 AEG standard, and it also comes with the same function already on their M4 AEG: When user turns to “Safe”, it will release the spring in the gear box back to normal state.

Features:
14mm”-” Steel made Flash Hider.
Nylon Fiber Handguard with 14.5 inch outer barrel.
The outer barrel can switch into 10.5 inch by removing the extended barrel assembry. User also can replace with shorter inner barrel for making their own CQB mod.
Comes with metal frame with no marking and comes with a removable carrying handle.
Standard 20mm rail on the upper frame for rail attachments.
New designed KATANA Split Gear box system comes with a changeable cylinder unit and the gear box in the lower frame.
The Red Cylinder Set (400 FPS) is included.
The new gear box can compatible with most of the parts of ver 2 gear box (gear set, selector plate and motor). 
When user need to change the cylinder unit, please ensure the selector is in “Safe” before changing. 
Adjustable Hopup system and inner barrel are compatible with TM M4 AEG standard.
Bolt catch function available for easy Hopup adjustment.
Nylon Fiber made Expandable Battery Stock which Store up to 9.6V twin stick type batteries.
Spring release function when user switch the selector to “Safe”.
Ready to go for 350 – 400 FPS with the standard Red cylinder unit.
Included 430 rounds M4 Hi-cap Magazine.
Compatible with most of the TM M4 style magazines in the market.

** Please note that Battery and Charger are not included**

Specifications:
Length: 805mm, 885mm (Stock extended)
Barrel Length: 363mm
Shooting Mode: Safety, Semi-Auto & Full-Auto
Weight (g):  3020 (gun with mag), 3860 (with box)
Gear Box: WE KATANA Split Gear Box with changeable Cylinder unit
Color: Black
Battery: 9.6V twin stick type Battery 
Magazine Capacity: 430 rds
Material: Metal & Nylon Fiber
Bullet type: 6mm BB
Power (Muzzle Velocity): 350 – 400 FPS with the standard Red cylinder unit.
Manufacturer: WE