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Old 02-09-2020, 06:06 PM   #1
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Inconsistent Hop

Greetings friends,

I have a frustrating situation with my rifles.

Specifically in my wolverine VSR, I am having a weird situation where the hop up will sometimes decide to over hop or underhop. Overall accuracy is kind of lacking too but not terrible. Compared to my A&K M24 with maple leaf HopUp tensioner and maple leaf autobot bucking, the accuracy is not as good, and significantly more inconsistent. What is strange is that there isnít a specific pattern to the hop. Sometimes it will be dead set accurate, shoot well for 15 rounds, and then just decide to start over hopping, underhopping, or throwing bbís slightly off center.
Of course this sounds like something is not set in place and I have motion in my chamber... but where would the motion be happening?

The VSR has an action army HopUp chamber, maple leaf omega concave nub, autobot 70 bucking, a maple leaf crazy jet 428mm barrel, and is shooting .4-.48g bbís at 3ish Joules with a +/-5fps fluctuation. (Probably smaller since now bedding in regulator.).
I have bedded the HopUp bucking for ~1000 shots.

Any ideas would be most appreciated cause Iím stuck!
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Old 02-09-2020, 08:04 PM   #2
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Shim the AA arm with some HVAC tape. Swap the ML nub out for a skeees or panthera.

After that, personally, I'd swap the ML CJ for a steel barrel (brand doesn't matter, just make it tight and straight) and then the rubber for a 60 degree.
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Old 02-09-2020, 11:28 PM   #3
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Quote:
Originally Posted by AccurateDMD View Post
Shim the AA arm with some HVAC tape. Swap the ML nub out for a skeees or panthera.

After that, personally, I'd swap the ML CJ for a steel barrel (brand doesn't matter, just make it tight and straight) and then the rubber for a 60 degree.
Thanks for the tip mate. I read your extensive testing on the skeees and panthera nubas just now and since I am US based I purchased a skeee nub. Hopefully this will do the trick.

When it arrives I'll test and go from there, but just thinking--what do you think are the reason for my issues? seems like most people have no issues with the AA + maple leaf nub combo, but its definitely not working for me...
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Old 02-10-2020, 05:20 AM   #4
 
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Its the nub. I had a similar problem with one I worked on. Though in my case it was a combination of the nub and nozzle length.
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Old 02-10-2020, 09:06 AM   #5
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I think it's Maple Leaf QC. Their nubs are hit and miss. I also think a lot of people 'settle' for what they think is good accuracy and consistency.

You may also want to try the Mr. Hop bucking, as I've gotten better results than with the Autobot. Don't worry too much about the seal, it shouldn't effect consistency.
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Old 02-10-2020, 09:13 AM   #6
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Thanks all. Appreciate the tips and looking forward to implementing the upgrades!


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Old 02-10-2020, 12:24 PM   #7
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May be maple leaf nub. Replace with panthera.


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Old 02-10-2020, 05:53 PM   #8
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Another thing to check would be how your hop up chamber is sitting in the outer barrel. I've noticed a lot of the outer barrels are pretty substantially larger than the hop up chambers that fit in them, meaning your chamber isn't sitting in the center once its screwed to the base. Basically this means bad nozzle alignment which could show up as a whole host of problems.

You could try wrapping the hop up chamber in tape or something to centralize it in the outer barrel better before screwing it down. Might help.
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