Outside(?) the Gearbox: How to Fine Tune a Hopup Unit.


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Published: 4 years ago
Here it is! The long awaited video on how to fine tune your hopup unit and squeeze every bit of range and accuracy out of it you can.

How am I doing? Leave a comment to critique, or to suggest I do something different! :] As always, leave a comment saying what you want me to make a guide on or a review on.

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comment  Comments

anyone know what material is used to make the nub?

2 weeks ago

Will Green g&g Bucking work with modify nub? After ther sanding procedur of cours

2 weeks ago

The thing is just buy the madbull blue bucking and use the flat knob spacer and u dont need to do any of that just for like 20 € and u have a perfect flat hop I guess :D

3 weeks ago

the eraser makes it amazing

1 month ago

Am I the only one who thinks this guy needs to take a vacation and get a manicure? :) that thumb needs some love!

1 month ago

lol who disliked this video LMAO wow

2 months ago

this video makes me hard

2 months ago

Why do you file the nub on the bucking?

3 months ago

I just ordered the Firefly flat hop nub so it goes right into the hop up arm arch thats already there but it all nice and flat. I love mine so far

3 months ago

Would this work better than a namazu firefly and a prommy purple

4 months ago

You never explained how big to make the nub compared to the hole in the hopup unit

4 months ago

So what are all the materials that i can use to make the nub m’dude.

4 months ago

BradBadgerSecondary literaly just a pink eraser that you cut to size

3 weeks ago

does the nub need to be perfectly square/straight or can there be slight imperfections?

6 months ago

Can be imperfections

4 months ago

May be better to use plumbers tape than dental floss.

7 months ago

talking about badly designed, let's think about when it's designed and when did adjustable hopup became a "thing"
and how little manufacturer did to improve the system.

yeah, and tons of "innovative" hopup designs are just data mining from 80s - 90s japanese design that wasn't popular at the time.

8 months ago

hello... I havent tried this mod but I was wondering if you can answer my question. I bought a replacement bucking for my AEG but after doing so my gun jams in full auto. it shoots fine in semi. I tried my cousins bucking and same result so we decided using the original one and it shoots fine again. Idk if there are differences between bucking colors but my original one was green and the new one i bought is gray and so is my cousins bucking. Id like to know whats going on with my hopup

8 months ago

Well the bucking might be harder or softer then the original one, and varying on your power of the gun you should look into having a softer or harder bucking. But in the end I don’t know how it’ll affect firimg at auto or semi.

4 months ago

Does the hop up make the gun more powerful ???

9 months ago

Okay

8 months ago

Do u think a 400fps gun can kill birds???

8 months ago

Great video, thanks!

11 months ago

You should make a video of how not to get chicks...........oh, is this it? Never mind.

1 year ago

Kyle Wilson You sound like a virgin

3 months ago

Don't need women. Watched this video, now I can nut out a window; 250 feet and just blast chicks in the face. Pinpoint accurate.

6 months ago

Kyle Wilson why did you watch the video then?

10 months ago

ReviveAirsoft, duh

10 months ago

Kyle Wilson you're cool

10 months ago

Same floss I use and I always need more super glue in my life...let's do this lol

1 year ago

Do you do custom work for hire? I just bought a Krystal vector. I’d love to have this professionals done.

1 year ago

AAA battery will turn the bucking inside-out quick, little hot tip lol

1 year ago

Would this possibly work on a vsr 10 hop up too?
I know with the stock hop up, the bb will shoot off to the right.
And I was wondering if anyone knows much about that?

1 year ago

Doesnt matter what you use it on, it’ll work.

4 months ago

awesome.. did three aegs with ur videos.. each with fantastic results! 120ft hitting a plam size target

1 year ago

F u






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That’s how you spell fun

1 year ago

I know I'm a day late to the show. This video has helped me flat hop. Great job. I do a clue things different though. I use a fine needle file to smooth out my bucking. I also use sugru or molding clay to fill in the barrel bucking lock. Helps with airseal.

1 year ago

can you just buy them already flat hopped>?

1 year ago

The design is perfectly sound for the FPS and BB weights it was designed around.

1 year ago

Therefore it is not a bad design, the later systems operating under different constraints are bad implementations.

1 year ago

sabartadrel

And?

1 year ago

you just touched the barrel??

1 year ago

l0l

2 months ago

Wtf

4 months ago

You may want to speak a bit slowly, a bit louder and be a bit more carefull on articulate enough.
As a non-native speaker, it's a bit hard to not get lost, and understand technical terms

1 year ago

Guillaume Chopelet just slow down the video

1 year ago

dmart63 I understand most people without issue, I struggled here. Just trying to give some feedback, I don't really care

1 year ago

Guillaume Chopelet

He speaks clear English. You need to learn to speak better, not him

1 year ago

I know i'm a bit late to the party, but what hop up unit is that? it looks nice af.

1 year ago

Gearworth Buying lonex

1 year ago

hahah 170ft on stock guns, thats actually really awesome high tier for japanese guns under the 1joule law. just saying

1 year ago

Sugru for r hop?

1 year ago

Sugru for r hop?

1 year ago

you didn't show how to take apart hop up lmfao 😂

1 year ago

How do I contact you to purchase a r-hop and tighbore barrel combination?
Thanks for all you do!

1 year ago

Airsoft Obsession they have them on umbrella armory

1 year ago

Hey man. are there feeding issues if you have your poppet dwell and rate of fire to high for the wolverine gen 2 inferno? Thanks

1 year ago

Sheridan saul no it just wastes air

1 year ago

Great video. I followed the directions and had great results with my Lonex L4-02. Thanks very much.

1 year ago

This video and your shimming video singlehandedly helped me save my G&G Firehawk.

2 years ago

So basically, with your mod, you don't need to fill the window of your barrel like other g/r flat hops?

2 years ago

Thanks so much for the video. After spending a few hours tooling around I was able to mod and install a flat hop on a Cyma 005 M4 using the stock Hop up chamber, a Madbull 6.03 tightbore, a green G&G bucking and a piece of rubber stopper as the nub (it's a little more stout than eraser but not by much). I'm now having issue adjusting the hop up and keeping it in place, the hop up gears and wheel seem to be under an undo amount of stress and won't stay in place after dialing. The resistance on the hop up arm seems a little tough but the height of the nub is only about 3.5mm Any suggestions? Thanks a ton!

2 years ago

Will Pickett check you have the little plastic cogs/gears the right side facing out , I noticed they look very similar on both sides but there is a small step on the back that keeps the teeth engaged in one another if it’s not that possibly the square edge on the nub is catching as you wind it up and down .

1 month ago

Did this on my g&g cm16 srl and what a difference! Bb flies perfectly flat, I saw a huge increase in range and accuracy as well!

2 years ago

Wow fantastic in depth vide keep up the good work u my good sir have earned yourself a sub

2 years ago

I have a stock ICS G33. It comes with a flat hop. The bbs seem to be hitting the ground at about 55-60 meters and I want them flying further and with more accuracy. What can I do?

2 years ago

Thanks for the help. Much appreciated.

2 years ago

Better hop up rubber, I would recommend Lonex. Then better barrel (PDI). Then just make your air seal better, finally make your gearbox more constant.

2 years ago

I have a couple of questions concerning this mod. Can i use something else instead of a Dremel to get the same results? And is dental floss really the best way to get the best seal? I'm thinking somekind of tape. Thx!

2 years ago

Gorsken what I use instead of a dremel is some sandpaper. Just attach the bucking to the barrel inside out and then sand the mounds off. As for the dental floss, Teflon tape is the best to shim out the space.

2 years ago

From what I gathered, is R-hopping just flat hopping with a patch over the barrel Window?

2 years ago

+DarkerSavant alright thanks mate

2 years ago

Yes, but getting that patch perfect is tough. It accomplishes flat hop but more consistently. It should be called Flatter Hop lol.

2 years ago

nice mod...i just fabricate a concave solid hop nub....flaten the mund part without removing it a seal it using silicobe sealant which can be undone much better than teflon.

2 years ago

My gun is flat hoped with a ProWin hop up unit, firefly namazu flat hop nub, and promi purple bucking and it shoots like 175 feet.

2 years ago

what sniper is that on the wall above the p90 its sexy as fuck i need one

2 years ago

TheSpandexcatcher king arms blazer 93

2 years ago

can I try this to flat hop my krytac?

2 years ago

What nub did you use and did you modify the krytac hop arm?

1 year ago

I have an spr with a prometheus m160 it was shooting 600-620 fps with .25, with the flat nub its shooting 650 fps consistent and its reaching 250 feet without problem, so yes you can

2 years ago

FightFireWitFIre I get 100% what u mean and though about that too but when I did this to my gun it seems to improve accuracy and isn't inconsistent. I think that smallest tilt isn't going to affect the bb's travel, especially when it's tilted front and back and not side to side.

2 years ago

I've been thinking about that too. One issue with how he does it in the video is that the eraser will not be able to pivot when the hop up arm moves, meaning the nub will be tilted ever-so-slightly towards the front or back of the gun depending on the hop up arm's position (it's hard to picture in my head, but I think it would be tilted towards the back of the gun until the arm is completely level). This seems like it would lead to inconsistencies, unless the eraser is soft enough to level itself out against the bucking.
But the hop up arm/nub on the Krytacs don't see like they could be made to pivot, because the stock nub doesn't pivot, it's just round.

2 years ago