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sheywood

Junior Member
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Posts: 21
Reply with quote  #1 

Hello

I own two Krytac Kriss Vectors (KKV) (one for me, one for my son) and I'm seeing about 25 FPS difference between them shooting .28g bbs

One KKV shoots ~325FPS the second KKV shoots ~300FPS.

Is this a high enough level of variability that it warrants cracking open the second KKV shooting ~300FPS to see if there is some type of issue? Or is this level of variability within acceptable tolerances?

Each KKV uses a Valken Airsoft Battery LiPo 11.1v 1000mAh Battery and I've replaced the stock springs with the Evike.com Irregular Pitch Airsoft AEG Tune-up Spring (Power: M125 400~470 FPS)

Also, I'm assuming that ~325FPS with .28g bbs is about what I should be seeing

Other than the difference in FPS there are no other issues with the guns. The two shot cycle works great, full auto works great, they have about the same effective range, my son gets a huge kick out of all the attention his gun gets...

Appreciate thoughts and feedback on

1. Should I be concerned about the ~25 FPS difference between the two KKVs?

2. Is ~325FPS with .28g bbs and the upgraded spring about what I should expect

Thanks in advance for your help

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sheywood

Junior Member
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Posts: 21
Reply with quote  #2 
So I decided to throw caution to the wind and tear down the vector that was 25 FPS slower. I've never so much as turned a screw on an airsoft gun before but I had lots of youtube videos to make me feel brave...

I'm pretty sure it was a lubrication issue. The piston appeared to be lubed around the o-ring but it was really dirty and the cylinder for the most part appeared un-lubed. I washed both pieces and then applied Lucas Oil X-Tra Heavy Duty Grease to the inside of the cylinder and the o-ring. The interwebs suggested highly viscous lube like this not only lubricates, but strengthens the o-ring seal

We don't have a chrono at the house but an unscientific range test in the woods this morning appeared to show the previous 25 FPS under performer now scorching the other one. Curious to see what the chrono will show this weekend when we get out to the airsoft field. Semi, double, full auto all appeared to work fine. 

That said, there were three terrifying moments
  1. When I opened the gearbox and bumped it at the same time so the gears and tappet arm and spring were just kind of laying there, waiting for me to figure out how to put them back together
  2. When I watched the spring for the tappet arm fly across my garage and land "over there" (found it, miraculously)
  3. When I first test fired it and the bb's dribbled out at my feet. This was due to the fact that the outer nozzle that connects directly to the cylinder head nozzle and is moved back and forth by the tappet arm / tappet plate was not placed correctly back into the bracket that is controlled by the tappet arm / tappet plate. Took the whole thing apart again, watched the tappet arm spring fly away once more (no kidding, slow learner here), seated all of the tappet / nozzle stuff correctly, and was happy / lucky to see the above mentioned results
Hopefully it all holds up to another full day of play this weekend
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kinesis

Regular Member
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Posts: 100
Reply with quote  #3 
cool ...  you experienced your first exploded gearbox. =) future openings will seem a breeze after this one. i went through the same if it make you feel any better. =)


=)
-k

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Rsnubje

Junior Member
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Posts: 2
Reply with quote  #4 
You might want replace the nozzle of this gun. I read elsewhere on this forum that the stock one leaks a fair amount of air. Replaced it with an SHS M4 nozzle, gained about 5-10 FPS.
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