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KSC/KWA/Umarex HK MP7 DangerWerx valve installation tutorial


Wingmann

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1.- Push the main pins out.

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2.- Pull from the end cap, taking out the stock assembly.

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3.- The charging handle will pull out the bolt assembly.

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4.- Basic disassembly.

 

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5.- Free the bolt from the charging handle.

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6.- Take it out with the recoil spring and guide.

post-67748-0-27982800-1313015469_thumb.jpg

 

7.- Bolt assembly plus recoil spring and guide.

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8.- Take the guide and spring out-

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9.- Undo the screw holding the nozzle springs retainer.

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10.- Pull the retainer out and free the springs.

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11.- The springs will go inside. Put the retaining pin aside.

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12.- Undo the four screws that retain the front metal part blocking the nozzle.

 

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13.- Two on each side.Be sure to use an appropiate screwdriver, these are soft.

 

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14.- Take out the blocking metal part.

 

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15.- You can pry it out using the small cut visible inside the hole.

 

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16.- Part out.

 

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17.- Now the nozzle is free and you can safely take it out of the bolt.

 

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18.- Pull the valve retaining pin out. Pic shows the left side, but you should do it from the right.

 

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19.- Default valve and nozzle. Pin will self retain. Do not force it out.

 

post-67748-0-37769900-1313015567_thumb.jpg

 

20.- DangerWerx valve vs. standard valve.

 

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21.- Place the DW valve inside the spring in the nozzle.

 

post-67748-0-39769900-1313015586_thumb.jpg

 

22.- While pushing the valve in, relocate the retaining pin so it holds the valve down.

 

post-67748-0-09951300-1313015593_thumb.jpg

 

23.- Perfect.

 

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24.- Re-insert the nozzle inside the bolt. Be careful to place the springs over the nozzle so they don't get caught on anything.

 

post-67748-0-17328000-1313015603_thumb.jpg

 

25.- There are cuts on each side so you can manipulate them.

 

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26.- I made this little hook out of a guitar spring to pull the springs out. It's possible to push them from the cuts too.

 

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27.- Fishing time. Pull the springs out.

 

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28.- Keep it there and pick the retaining pin.

 

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29.- Place the pin and release the spring.

 

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30.- Repeat with the other one.

 

post-67748-0-58085900-1313015635_thumb.jpg

 

31.- Nice and tidy. Screw the locking screw back on.

 

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32.- Insert the recoil spring and guide.

 

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33.- The back of the guide goes in there.

 

post-67748-0-77202100-1313015651_thumb.jpg

 

34.- Place the charging handle on the bolt.

 

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35.- Insert the whole stock and bolt assembly and voila! Ready to rock!

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Many thanks to DangerWerx for providing the valve for this tutorial.

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