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WE USA Full Metal KATANA II M4 Carbine Advanced AEG Rifle (Q.S. Gearbox) - Crane Stock

ID: 45743 (AEG-WE-KT001)
3.3 stars, based on 9 reviews
WE USA Full Metal KATANA II M4 Carbine Advanced AEG Rifle (Q.S. Gearbox) - Crane Stock
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$360.00 $252.00

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This gun has a muzzle velocity rating (FPS) between 366 and 500, and is compliant for export to Canada.

WE USA Full Metal KATANA II M4 Carbine Advanced AEG Rifle (Q.S. Gearbox) - Crane Stock

The WE-Tech KATANA system is a revolutionary concept that utilizes a replaceable upper cylinder unit much like Systema's PTW rifle. The innovative cylinder design allows for simple, easy and fast swaps of the upper end of the gearbox making the rifle adaptable to all scenarios of Airsoft gaming. The cylinder housing is CNC machined from a billet of aluminum providing optimum strength. Stainless Steel nozzle and end caps, a high tension internal spring, and the reinforced polycarbonate piston make the KATANA cylinder rock solid. The lower gearbox section is completely constructed of high strength metal alloy with steel bushings and a steel alloy gearset providing great reliability.

Externally the metal receiver and full metal barrel assembly provide a realistic, durable feel furthering the training rifle experience. The detachable carry handle reveals a railed upper receiver for mounting optics and the working mock bolt catch allows for easy hopup adjustment. Cylinder replacement is made easy by simply removing the rear receiver pin.

The WE-Tech KATANA system is an extremely adaptable platform that will serve you well in any Airsoft situation.

Look for the WE USA logo on the WE Katana when you buy a Katana. The WE USA logo indicates that this product is directly imported by the distributor, not a second hand product, with the newest specifications, newest updated internal parts and quality controlled right here in the USA on top of our dedicated / exclusive QC process at the WE factory.


  • Revolutionary KATANA Quick Swap Cylinder System
  • No complicated electronic internal component like the Systema PTW.
  • Takes all standard AEG hicap magazine!
  • Includes the 400 FPS Red Cylinder
  • Full Metal Receiver and Barrel Assembly
  • Detachable Carry Handle
  • Railed Upper Receiver for Optics
  • Working Mock Bolt Catch for Easy Hopup Adjustment
  • Nylon Reinforced Polymer Handguard, Pistol Grip and Stock
  • Retractable Crane Stock
  • CNC Milled Aluminum Cylinder with Stainless Steel Nozzle and End Caps
  • High Strength Metal Lower Gearbox with Steel Bushings and Steel Alloy Gears
  • Heavy Duty Polycarbonate Piston
  • Extremely Adaptable; Go from CQB to Outdoor FPS in No Time
  • Easily Swap Cylinder Unit in Seconds!
Length: 800mm-885mm, Adjustable
Weight: 3270g
Inner Barrel: ~350mm
Magazine Capacity: 300rd Hi-Capacity. Works with Matrix, G&P, Tokyo Marui and other compatible M4 / M16 Series Airsoft AEG Magazines
Muzzle Velocity: 370~400 FPS (Measured with 0.20g BBs)
Thread Direction: 14mm Negative
Gearbox: KATANA Gearbox (Compatible with Ver.2 AEG Parts)
Motor: Long Type
Fire Modes: Semi/Full-Auto, Safety
Battery: 9.6v Small Butterfly Type recommended (Battery not included)
Hopup: Yes, Adjustable
Package Includes: Gun, Magazine

Manufacturer: WE-Tech

Things you may need to get started:
    Battery and Charger Required to power your AEG; use a high quality battery and charger for best results.

    Spare Magazines Stay in the fight longer by bringing more ammo with you.

    BBs High quality precision 6mm BBs recommended; Use 0.20g 0.25g BBs for best results.

    Silicone Oil Basic cleaning and lubrication maintenance help keep your Airsoft AEG in top working order.

9 Customer Reviews

by Steven E. on 02/17/2016
Looks good
Amazing concept

Breaks VERY easily

So if your really good at fixing airsoft guns then go ahead and get this if you want to replace most of the gearbox and deal with the mag well issue. But if you want to use it out of the box with no internal modification then don't get if unless you have an extra $300 and a lot of time.
by Donald B. on 09/30/2015
"PART 2:
I disconnected the battery and decided to pull the gear box, as it was locked up. When I loosened the motor, it freed right up. I went ahead and took it apart and disassembled the gearbox. One of the wires to the trigger switch had come off, a poor solder job. I also found the broken tooth from my first day, in the bottom of the box, something to keep in mind, broke stuff can fall into your gearbox. I re-soldered the contact wire, and it works well. I had a high torque Matrix motor, so went ahead and installed it at that time. It adjusted easily, and has no whine. I do not know if it is my work on the gearbox, or what, but it will often fire auto, while on semi. It was doing this before it broke electrically though. If I purposefully squeeze the trigger, it tends to fire semi, If I double tap, an old shooting habit I picked up in the Army, it will tend to full auto. I have not fixed this yet.

While I was at it, I decided to install a Madbull Tight bore, ProWin hop-up and Madbull 60 Red Shark bucking. The ProWin was very tight, it would not fit in the barrel, I had to dremel shave it down. I ended up going back to the stock hop-up and put the ProWin in my Polar Star build. The Madbull Red Shark Bucking however works great. I shoot 25 gram BBS with it. I currently have an, SHS Airsoft M4 Hop Up Chamber CNC 7075 Aluminum W/ Bucking & Nub AEG Gun Set, ordered from Amazon. I like it because it uses O-ring seals and is CNC machined aluminum. I will see how it works. The stock Hop-up does not really like the Elite Force Mid-caps I use. I think their springs are too week, but thats another story.

Because I do not like the trigger response at this time, and want MOSFET, I have ordered the Gen 4 ASCU unit without electronic hop-up, but with microswitch trigger. I think that this will fix everything. I also will use 11.6 Lipo when this is finished. does it perform. I can say that I am old school. I like my M4/M16 to have a realistic ROF, 16-18 RPS and I like low cap or mid cap mags, I regularly shoot WE GBB open bolt in my games for that reason. I want this for my winter gun, and just because. I took it out a few weeks ago, and used it for 8 hours of airsoft. I played five different scenarios that day. It performed well. I managed about 8 kills that day and it was accurate. I currently have it sighted in for 150 feet using red/green dot rail sight, (took off the carry handle) and it hits man size targets with no problem. I went through one battery that day and it had plenty of charge when I got home, but remember that I am old school, I only use about 300 - 400 rounds in a day. Im too old to run and BB hose.

I may update this when I get the new ASCU unit installed and let you all know how it is doing.

Thoughts: This is a serious weapon, that has great potential in the right hands. Great for someone with patience, skill, and time. If you are a noob, or tech challenged, look elsewhere for something with fewer bugs to work out.


Excellent external build, fit, and finish

Realistic weight and balance

Ability to quick change cylinders

No green goo in gearbox, well shimmed.


Best suited for experienced or mechanically inclined Airsofters

Internal build lacking (but easy to fix before it breaks it you have moderate skill)

Piston cylinder could use re-design (AOE problems)

Poor QC for electronics

No fuse in this system, (I was surprised)

I will give 3/5 stars because it is is a cool weapon, and so far, the fixes it needs are simple enough. If they would fix the issues with e cylinder, and gearbox, it would be 5/5

When I am done tweaking mine, it will be 5/5 as well, I still have hope. LOL
by Donald B. on 09/27/2015
"Part One:

Where to start........I love/hate this weapon and so far it love/hates me from what I can tell. I will say that in its present configuration, it is not for the tech challenged. This product has such great potential, and I believe that it is destined to become great someday. However, it is not great from the factory as it is currently sold.

Right out of the box, it is a beautiful weapon. The fit and finish are excellent and the weapon just feels like a beast in your hands. I love the way it breaks open, and the way you access the piston cylinder is fantastic. The buffer tube is secured using a screw to an inner bracket and the real tube locknut then provides tension. Remember to loosen locknut before removing screw so you do not strip it out. The weapon had not rattles from the factory, except for the sling mount (Expected). External QC is excellent. Internal QC, however, is not.

OK, now for the love/hate.......When I opened the box, of course I wanted to play with it. It came with the Red cylinder and I installed my own fully charged 9.6v 1600mAH butterfly into the machine. I pulled the trigger four times and received a satisfying pop, pop, pop, then nothing. It had locked up. I had not fired a single BB through it yet. I pulled the cylinder out and inspected the piston teeth. The #1 thick tooth had broken off. So much for high hopes, huh. To fix this, I was thinking, OK, I'll order a new piston....wrong. There were none available at the time. So I thought, OK, I wanted a Blue piston for CCB anyway and they make two red cylinders for different FPS, (one approximately 350FPS and the stock one approximately 400FPS). So, I ordered the two new cylinders and then did some research online to find out what went wrong.

I found an interesting article about the piston not being back far enough, and not catching the motor well enough. It suggested shimming the piston about 3/16 - 1/4 inch, to center the first tooth in the rounded cut out. It suggested using vibration dampening rubber and cutting out the spacer with punches. I disassembled the piston, made a temporary first tooth out of an allen set screw and die grinder (knowing it was only temporary and would not last more than a couple hundred rounds), and then went to the local ACE hardware store (I prefer old fashioned HW stores over big box, I am 50 y/o after all). I looked around their screw and washer section and came up with 3/16th thick white nylon washer with a little larger outside diameter than the gear piston, to make sure metal teeth did not slide out over it. I had to drill out the center hole a fraction for the spring bolt to go through, that connects the piston to the piston head. I placed the spacer between the piston and piston head. I then reassembled with my temp piston fixed 1st tooth. I tried it and it worked well in the weapon. It chronoed at 420-430. I figure this is because of the spacer effectively shimming the spring causing it to be shorter and thus increasing tension. Point is, it worked. The 1st tooth is now at about the middle position of the rounded cut out. When my new pistons arrived, I did the mod before even installing them to find out how they worked. They both showed increased FPS. The 350 red showed 385, the blue showed 340-350. So now I'm thinking I love this weapon again....right.

I then went out to sight it in, I'm old school and can't shoot a weapon unless properly sighted in. I still have drill sergeant nightmares about weapons handling, LOL. Anyway, I was happily sighting in my new beast, when it stopped working again. I'm thinking, you have got to be kidding me. Only this time, it's locked up because the piston is in the rear position and putting stress on the motor. I did get it apart, gingerly, and inspected the cylinders, expecting a fault there. Nothing..... It was still perfect like I had fixed it.

Continued in part 2

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