DIY: Install Danger Werx Low Power Flute Valve in the KWA Kriss Vector
Out of the box, the Kriss Vector is a marvellous piece of airsoft engineering. Relying on KWA’s NS/2 system the gun is gas efficient and delivers a powerful shot clocking in at 360 – 370 FPS (0.20g BBs) it’s great for most outdoor fields, but for those of us playing on CQB fields where the FPS limits are governed to 350 FPS this gun shoots too hot.
This step-by-step guide will show you how to get your Kriss Vector to those lower FPS limits by swapping out KWA’s OEM fluted “Jet Nozzle” for the Danger Werx Low Power Flute valve. The Danger Werx low power flute valve can be used in most NS/2 applications and the Kriss is no exception.
Step 1: Separate the lower assembly from the top
Take the gun apart by removing the pins to gain access to the lower assembly. This information on how to separate the two halves can be found in you owner’s manual.
Step 2: Remove bolt system from lower assembly
Remove the Super V Bolt assembly from the lower to reveal the loading nozzle/bolt assembly.
Step 2a: Remove nozzle assembly from bolt system
Twist the nozzle assembly to remove it from the Super V blow-back system.
Step 3: Remove side (2x) pins from side of bolt
On the sides (“wing”) of this bolt assembly you’ll find 2 spring pins holding the nozzle blockers. Tap them out using a punch and a hammer. It’s important you don’t get a punch too small or else you will wedge the spring pin, counteracting the spring pin making it wider and harder to punch out.
Step 4: Remove the rear pin from nozzle assembly
Towards the rear of the nozzle assembly, remove the spring pin holding the rear portion in.
Here are the 3 spring pins removed from the nozzle assembly.
Step 5: Remove the nozzle blockers
Remove the nozzle blockers from the “wings”. You can pop them out by sliding a small screw driver from inside near the nozzle. Sometimes this part can be very difficult to remove and may pop out from the force and go flying across your work area, take care not to lose these pieces. Applying some heat from a heat gun may help to release these two blockers. Here’s a photo of all the pieces removed from this assembly.
Step 6: Remove loading nozzle from assembly
The loading nozzle should now pull out freely from its housing.
*Note: If you have removed the pins and locks, and the nozzle will not come out push the silver part on the rear to push the nozzle out.
Step 7: Remove pin from loading nozzle
Using a punch remove the rear pin from the loading nozzle to gain access to the internal components.
*Tip: If you are having trouble trying to stabilize the loading nozzle while you tap out the pin, place it back into the housing in reverse to help keep the nozzle straight and to keep it from moving around.
Here is the nozzle with the pin removed.
Step 8: Remove piston head from nozzle
Once you’ve removed the pin, you can take the rubber piston head off the assembly to gain access to the internals. Just work your way around the piston head without tearing it. I just used my finger nail and slowly pried the two pieces apart working my way around the circumference. Once you have it off you can dump the internal components out, there are two pieces, the fluted “jet” valve and the valve spring.
Step 9: Swap the flute valves
Swap out the stock KWA flute valve for your new Danger Werx low power flute valve. As you can see from the photos the two pieces are fairly similar in size, however the Danger Werx flute valve restricts the gas flow being delivered to the BB, causing a lower FPS.
Place the flute valve in the spring and place the whole thing back into the nozzle, take a minute to ensure the spring and flute valve are seated correctly in the loading nozzle.
Step 10: Follow this guide backwards to put it all back together!
The Danger Werx low power flute valve should have lowered your Kriss Vector from 370 FPS to a more indoor-friendly
320-330 FPS 310-320 FPS (***edit: I have a more accurate reading based off another user who games his more frequently than I do, and the FPS output is more accurately rated as 310-320 FPS, and fairly consistent at 315 FPS).
Now go out and have fun!