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Fbeca

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Reply with quote  #1 

Hi all!

Bought a Krytac Mk2 CRB about 5 months ago used (was told it had 2 months use and looked new to me) and was shooting 398 fps consistently (in my hands) and a couple of weeks later 385 fps (spring settling in? - original M120).

After playing for a couple of months and just changing the springs occasionally (to use an m90 to comply with the 350fps in a local field), yesterday back with the original spring chronoed only at 342-346 fps...but otherwise shooting fine.

Does anyone think its just the spring or should I just grease the cylinder head o-ring through the window (several folks in other threads in this forum mentioned this...)?

If opening the gearbox should I just change to the laylax/Prometheus air nozzle and cylinder head made for krytac? Any other upgrades recommended?

Thanks!

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Kraken_Wrangler

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Reply with quote  #2 
1. Make sure you didn't lose your two springs around the hopup chamber.

2. Make sure the hopup is set to "3" (we use this setting for calibration.)

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Fbeca

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Reply with quote  #3 
Thanks for the reply. Springs are there and yes, these are all fps with hopup set at 3. With high hopup settings it’s about 5-10 FPS lower.Also I’m pretty sure I never left the spring compressed as I usually am carefull emptying “the chambered” bbs with a couple of shots in single fire which should complete a full gearbox cycle, right?
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Kraken_Wrangler

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Reply with quote  #4 
Quote:
Originally Posted by Fbeca
I usually am carefull emptying “the chambered” bbs with a couple of shots in single fire which should complete a full gearbox cycle, right?


It's not a guaranteed process when you clear a BB and try to reset the piston.

Though it's normal to lose 5-15FPS overall for a fresh gun in a few months of use. The spring does relax with use and will "settle" at a consistent output. 385FPS is still within the FPS parameter according to my chart.

If it goes below 375, then you may want to consider opening the gearbox and checking the o-ring compression, maybe touching up on some PTFE Silicone grease. Do not use Lithium or spray silicone in your cylinder. It'll drag down performance.
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Fbeca

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Reply with quote  #5 
Thanks. That’s exactly what I was thinking...the fps are consistent but at 348fps...I ordered the Laylax for krytac nozzle and cylinder head and will check the o-rings. If I need to change the cylinder, what’s your recommendation for an upgrade from stock? Thanks
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Kraken_Wrangler

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Reply with quote  #6 
I can't really offer a recommendation. But my personal preference goes to any CNC aluminum cylinders with ribs for structure. Then depending on your barrel length, Type 0 (no cut) or Type 1 slot cut.

I avoid brass and coated cylinders. Brass works well for a stock cylinder, but the weight leaves something to be desired. Coated cylinders can flake over time.
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Fbeca

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Reply with quote  #7 
Problem solved with a little lube in the o-ring through the cylinder port...
now consistent at 390 fps (+/-2 fps) Thanks

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