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Krytac crb randomly dropping heavily in FPS

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I've been having a couple issues with my Krytac CRB. When it's on semi, it shoots normally at 390 fps at first but then randomly drops to about 200 and the bb basically falls out of the barrel. On full auto however, the problem disappears. Internally I've shimmed the gears, and installed a maddog Cylinder, cylinder head, and piston, a prowin hopup chamber, and a maddog M130 spring that I've cut down to shoot around 390 fps. I've had the same problem with other springs I've used in the past so the spring can't be the problem.


Here's a video of what exactly the problem looks like:


Any help is appreciated.

Edited by PanagsAirsoft

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Well...hate to say this but you swap out some parts that are not really an upgrade over "stock" Krytac parts. Did you realize that most of the parts you replaced did what the stock Krytac parts should have accomplished without needing to change it out?



Stock velocity is M120 -390-400fps.


Stock Hop-up was also rotary...


Did you compression test your new parts before for you put it in?



You didn't accidentally mix some heavy weight bbs in with your "other" bbs did you?

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And examining MD parts...its "all" rebrands of lower grade parts.


SHS - Cylinder Head

Element - Spring Guide

Element - Cylinder

SHS - Piston


Sadly...you just downgraded the internals of your Krytac.



I did a compression test on the krytac cylinder and it was leaking like crazy which is why I switched it out. If they are truly better, however, I might try to use both krytac and maddog parts together and see if they seal. Could the problem possibly be with the tappet plate or gears?


Edited by airborne101

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Most likely is the nozzle getting slightly jammed in the hop up. Like I said, check to see if you can see wear marks on the nozzle. If it's not that then we start looking further. But don't try to mix parts, it's a recipe for frustration. Put the Krytac bits back together carefully, checking for compression at each stage. The initial leak could have been something as simple as a cracked O ring.

When there's an issue, don't reach straight for new parts. Find what the problem is and fix it. It's far too easy to make yourself more problems.

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