• Sale
  • Regular price £150.00
Tax included.



Pre-order has now ended. You will be buying from standard stock which will have a grey hop unit and black hop wheel. Kits will be dispatched once anodising and laser engraving have been completed.


Well, here it finally is. After 9 months of design work, 6 months of prototypes and testing, and an entire Beta programme of 3rd-party independent testers... The Genesis Kit is finally ready.

This is a 12-piece kit that provides you with all the parts required to make your KJW KC-02 compatible with the wide variety of VSR hop rubbers and VSR barrels out there in the airsoft world, but also does soooo much more!

You can watch the walk-through and installation video here:

The diagram in the pictures explains much of the detail of each part, here's a high-res download link for it:

The kit contains 12 parts:

  • KC-VSR Cylinder-Nozzle, 7075 CNC aluminium
  • Genesis Hop Unit, 6061 anodised CNC aluminium
  • Diadem Hop Wheel, 7075 anodised CNC aluminium
  • 3 x Hop Keys: Arch, Bridge, Flat. 6061 anodised CNC aluminium
  • 3 x Flow Restrictors: Low, Medium, High. 6061 anodised CNC aluminium
  • 2 x 3mm neodymium magnets, for use with standard hop wheel
  • 1 x knurled steel return spring pin

This kit solves problems with poor air seal, solves the problem of broken cylinders, allows greater control of hop pressure and adjustment resolution, allows use of a huge range of existing VSR hop rubbers and barrels, and many other small improvements in functionality. It is a quantum leap forward in the performance and upgradeability of the KC-02 platform that has never been done before.

Testing has shown that 60 degree hardness hop rubbers are best suited for this hop unit due to the amount of pressure it applies when using heavy ammo such as 0.36g - 0.4g weights.

70 degree hop rubbers usually results in massive over-hopping and poor adjustment sensitivity, even with 0.45g+ weight.

This kit does require some skill and special tools to install. The most difficult part is inserting the knurled pin into the cylinder without damaging the cylinder. We highly recommend watching the guide video ( to show you what we mean. We used a hammer and punch set to install ours, but our Beta testers reported it is easier to do very carefully with a vice to press the pin into position. WE WILL NOT BE REPLACING PARTS YOU DAMAGE DURING ASSEMBLY SO BE CAREFUL.

The kit also requires some bedding-in to work properly once installed as all the new parts need time to wear into your gun, as not all KC-02 receivers and trigger mechs are the same. We recommend plenty of lubrication and manually racking the gun until it draws and returns nicely, cleaning the metal dust out of your receiver regularly. You're changing the core of your gun for one made of different materials and with much tigher tolerances, so it is not suprising if it doesn't cycle perfectly first time. It just needs to wear in.

The most common area to cause problems is the top of your trigger mech above the valve striker where the cylinder slides across the top of the trigger mech. This area usually has some rough casting in the corners which needs to wear down to suit the new cylinder. This isn't a problem for everybody but some of our beta testers used a file to smooth this area first. We found that racking the gun a couple dozen times and cleaning, followed by just shooting the gun for a while was more than sufficient to cut this area to the new parts.

As always, contact us via Facebook if you've got any questions.

Barrel and Hop Rubber Combo's we've tested and confirmed they fit, though performance varies:

  • 60deg Flamingo rubber + ML Crazy Jet barrel
  • 70deg Flamingo rubber + TNT barrel
  • 60deg G&P VSR rubber + Prometheus AEG barrel
  • 60deg TM VSR rubber + R-hop Prometheus VSR barrel
  • 70deg ML Autobot rubber + ML Crazy Jet barrel
  • 60deg ML Autobot rubber + ML Crazy Jet Barrel
  • 60deg PDI rubber + R-hopped PDI barrel
  • Laylax purple rubber + Laylax 6.03 barrel
  • 60deg ML Monster rubber + Laylax barrel
  • 60deg ML Delta rubber + Laylax barrel