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Kokusai Crimebuster SR-16

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This gun was purchased almost a year ago as a DMR platform and has been nothing but trouble up until about a month ago. Gas was leaking out of the front and back, mags were not feeding, unreliable hop-up, and just an all around frustrating gun. I sat down and looked at what needed to be done and these are the results.


Completed gun minus KAC suppressor










Hop-up unit with r-hop and unknown ID 363 barrel (brass)



Disassembled Crimebuster






Longer nozzle fit for M4 hop-up unit



Original valve stem broke for some odd reason so I made a new one with a better chamfer on the end



The last modification to the engine is the extra return spring for the valve



I was able to get +/- 2 fps at 125psi with .20 gram. On a previous test I achieved +/-.5 fps at 350 fps. I'm guessing the higher pressure has something to do with the minor inconsistency.



Overall this gun preforms amazing and I am very satisfied with it. I could see it achieving 550 fps no problem with a longer barrel with a tighter bore. This gun gives me satisfaction knowing that I can hit people with a semi only short barrel gun at long distances. I'm officially done with the modifications just a bit of cleaning and lubing from now on.

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