Huben Huben GK1 not precise at all. What I am doing wrong?

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Savagefox

Savagefox

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Sep 7, 2018
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Spain, Spain
I finally put some serious time to the pistol, and no matter what I do, I can't get good groups.

I tried many pellet shapes and power configs, the best results seem to be with some norica light slugs (1.8gr) at around 20 joule, yet the pistol shoots out of the group when she feels like it. I'm using tripod and resting bag, 10 meters, and it's a disaster.

Even more, changing pellet or power config means not only a slight comprehensible deviation, but not even hitting the board and re-starting again.

Laser boresight adjustment... useless even as a reference, leaving a perfect pellet + power config that more or less works (yet she always puts random shoots far out the group) and next day it changed completelly the POI. It's exasperating and I'm about to give up, and yes I cleaned the barrel, shoot with and without silencer etc...

I am behing too exigent with the pistol? Because I have 50 buck plinkers more precise than this and I'm feeling ripped off. Some of your shoot results on the treath are more or less comparable with mine, but some that have putted a dim tight group... with what pellet power config?

Is it just that it is very picky with ammo?
 
Is there a screw loose? An o-ring that needs replacing? I'd do a full disassembly on it, wipe it all down, silicone grease/oil where it needs it, and put it back together. Sounds like when I first started out with my first springer a couple decades ago where I didn't screw down the scope properly and so the shots were hitting every which way. Or my Avenge-X where it would group nicely in one spot, then a couple shots later group somewhere else and the speeds were not nearly as consistent as when I first got it. That issue was the o-rings in the regulator were hard and needed replacing. Probably some water in the reg too but I can't be sure.
 
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Savagefox said:
I finally put some serious time to the pistol, and no matter what I do, I can't get good groups.

I tried many pellet shapes and power configs, the best results seem to be with some norica light slugs (1.8gr) at around 20 joule, yet the pistol shoots out of the group when she feels like it. I'm using tripod and resting bag, 10 meters, and it's a disaster.

Even more, changing pellet or power config means not only a slight comprehensible deviation, but not even hitting the board and re-starting again.

Laser boresight adjustment... useless even as a reference, leaving a perfect pellet + power config that more or less works (yet she always puts random shoots far out the group) and next day it changed completelly the POI. It's exasperating and I'm about to give up, and yes I cleaned the barrel, shoot with and without silencer etc...

I am behing too exigent with the pistol? Because I have 50 buck plinkers more precise than this and I'm feeling ripped off. Some of your shoot results on the treath are more or less comparable with mine, but some that have putted a dim tight group... with what pellet power config?

Is it just that it is very picky with ammo?
Click to expand...
What caliber?
 
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miksatx said:
What caliber?
Click to expand...
.22

droyd said:
Is there a screw loose? An o-ring that needs replacing? I'd do a full disassembly on it, wipe it all down, silicone grease/oil where it needs it, and put it back together. Sounds like when I first started out with my first springer a couple decades ago where I didn't screw down the scope properly and so the shots were hitting every which way. Or my Avenge-X where it would group nicely in one spot, then a couple shots later group somewhere else and the speeds were not nearly as consistent as when I first got it. That issue was the o-rings in the regulator were hard and needed replacing. Probably some water in the reg too but I can't be sure.
Click to expand...

Open sights, 10 meter range, unregulated V1 version.

I don't ''feel'' inconsistency on the output, as I tunned just the right power for the pellets to not bounce back at me from the playwood.

I have to adjust windage very far from center, the barrel is definitelly not straight.
 
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Pix of mine seated pellets.

PXL_20250614_183839797.jpg
 
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ctshooter said:
I haven't heard a moderator mentioned - are you using one? Could be some cliping. Have you tried shooting bare barrel?

My other thought is the alignment of the magazine and barrel are off - have you see any shaving of lead around the mag area?
Click to expand...
It does sound like it is not centering the magazine with the barrel each time. Several things to look at there... could be from lack of lube in the bearing area, or lead shavings causing dragging of the magazine, or the lack of lubing of the mechanical catch and rollers that ride on the magazine.
 
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Airgun-hobbyist said:
It does sound like it is not centering the magazine with the barrel each time. Several things to look at there... could be from lack of lube in the bearing area, or lead shavings causing dragging of the magazine, or the lack of lubing of the mechanical catch and rollers that ride on the magazine.
Click to expand...

So I will have to dissasemble all the damn thing... poop.
 
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Savagefox said:
So I will have to dissasemble all the damn thing... poop.
Click to expand...
I'd suggest getting used to disassembly for the fact that it is a semi auto, and as such with all of it's moving parts, pins and rollers, should be regularly maintained and lubed to operate smoothly. I think you'll be pleasantly surprised as to the difference in the trigger pull with a cleaning and lubing of the pins, which will help you with accuracy as well.
 
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miksatx said:
Pix of mine seated pellets.

View attachment 570500
Click to expand...
Thanks for sharing. Is yours .22?

Anyways, with the .25, when you set it, there are TWO stages. First and second click as one pushes the pellet in. Do you have two distinct clicks too? Do you go one or two clicks in? Looks like TWO.

I tested no seating, 1 click, and 2 clicks. About 20 shots in each. No difference that I can tell.
 
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Ultralight said:
Thanks for sharing. Is yours .22?

Anyways, with the .25, when you set it, there are TWO stages. First and second click as one pushes the pellet in. Do you have two distinct clicks too? Do you go one or two clicks in? Looks like TWO.

I tested no seating, 1 click, and 2 clicks. About 20 shots in each. No difference that I can tell.
Click to expand...
Yep on the .25 2 places that are tighter but it the one I'm using a red dot. So I don't get the accuracy as .22 and .177 GK1.
 
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I disasembled the gun and examine it carefully. First... I can't belive that they are charging that much money for the gun... Second on the Gk1 pistol there is no barrel adjustment screws like with the rifle, only the 4 screws that hold the barrel part to the mag part and can have enough play to screw it tight and end up with serious barrel misalignments, so I tried to adjust it as good as I could and I spoted what I belive is the problem.

The mag chambers are not exact, maye because I have a V1 and those are the first units, I always thinked that the mag look a bit unpolished, some align well, others not so well, so that's why those random pellets impact out of the group no matter what, and that's why slugs are less influenced by it as they deform less with the misalignment.

What I have done?... aligned it as best as I can and dremel with a small metal polish thingy the barrel entrance so now it has a ''inverted crown'' that I hope facilitates pellet transition to the barrel without deforming it, still have to test. Also somehow my barrel ended up much more deviated to the right, I would prefer to leave the deviation in elevation instead of windage but I couldn't unscrew the barrel no matter what without a vise.
 
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Results after the fix.
-10m target.
Not great by any means considering I'm using a tripod, but at least there is no longer totally off impacts and I was using light crappy pellets, so maybe there is room to improve, at least now the pistol is ''usable''.

First group are penetrating the playwood so I tweaked down the power+ adjust a little the windage so pellets neither bounce back or mess with my wall, no changes in group.


IMG_20250620_212532.jpg





Those are pp800 results just for comparing, no tripod, offhand, not good either as it's a cheap ass bare minimum pcp pistol, but better.


IMG_20250620_212545.jpg
 
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