Huben Any issues or problems with Huben gk1 please share your experience

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I just recently watched the videos on GK1 disassembly. I can see how the process would be intimidating to a person who isn't mechanically inclined. Actually, I'd say a lot of people wouldn't want to casually disassemble it. I'll take mine apart at some time, but at the moment there's no need. So it's not that easy (for most people) to take a GK1 apart enough to access the magazine or barrel (to measure the bore).

It seems there's a manufacturing issue - some bore/mags are loose, and some aren't. Mine are ok enough to shoot 0.2175 body / 0.2205 drive band slugs with reasonable short range accuracy. Haven't stretched it out, simply due to home range capabilities. Maybe I just got lucky, or I'm not lucky, but haven't found out yet.

I do know that my GK1 bore is larger than my PP700SA bore. I can barely chamber the above slug in my PP700, it takes a slug starter. Whereas on my GK1 the slug goes in much, much easier. The PP mics at 218, and the GK1 around 0.220. At least this is what I can tell from recovered slugs from a mulch trap. The GK1 shot at 36 FPE, no idea for the PP700, undoubtedly a lot less. Yeah, these slugs are poorly cast, they came from my first round of casting on this mold. Dug them out from my trap a couple days ago.
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WobblyHand said:
I just recently watched the videos on GK1 disassembly. I can see how the process would be intimidating to a person who isn't mechanically inclined. Actually, I'd say a lot of people wouldn't want to casually disassemble it. I'll take mine apart at some time, but at the moment there's no need. So it's not that easy (for most people) to take a GK1 apart enough to access the magazine or barrel (to measure the bore).

It seems there's a manufacturing issue - some bore/mags are loose, and some aren't. Mine are ok enough to shoot 0.2175 body / 0.2205 drive band slugs with reasonable short range accuracy. Haven't stretched it out, simply due to home range capabilities. Maybe I just got lucky, or I'm not lucky, but haven't found out yet.

I do know that my GK1 bore is larger than my PP700SA bore. I can barely chamber the above slug in my PP700, it takes a slug starter. Whereas on my GK1 the slug goes in much, much easier. The PP mics at 218, and the GK1 around 0.220. At least this is what I can tell from recovered slugs from a mulch trap. The GK1 shot at 36 FPE, no idea for the PP700, undoubtedly a lot less. Yeah, these slugs are poorly cast, they came from my first round of casting on this mold. Dug them out from my trap a couple days ago.
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There is nothing wrong with the magazine. It's you! The GK1 is designed to shoot pellets, not slugs. Pellets are retained in the mag with their skirt in the small chamfer at the entrance of the mag. I have mentioned this issue many times in many other threads. Please read them. I will repeat myself again, there are no advantages using slugs in a pistol at pistol distances. In your PP700 you load to the barrel. In the GK1 you load in a rotating magazine. The barrel of the GK1 is essentially the same size as the PP700 in the same caliber of course. If you don't believe me, measure them up with pin gauges. I have.
 
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steve-l said:
There is nothing wrong with the magazine. It's you! The GK1 is designed to shoot pellets, not slugs. Pellets are retained in the mag with their skirt in the small chamfer at the entrance of the mag. I have mentioned this issue many times in many other threads. Please read them. I will repeat myself again, there are no advantages using slugs in a pistol at pistol distances. In your PP700 you load to the barrel. In the GK1 you load in a rotating magazine. The barrel of the GK1 is essentially the same size as the PP700 in the same caliber of course. If you don't believe me, measure them up with pin gauges. I have.
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Im pretty sure that is not entirely true. GK1 magazines definitely seem to differ slightly in terms of their tolerance for certain projectiles.

My GK1 rejects a lot of pellets also, not just slugs. For example, It will shoot JSB Kings just fine. But when I try JSB King Heavy's (which are slightly longer and have a different skirt shape) it will jam. In fact, so far I haven't been able to find any projectile (pellet or slug) that mine will shoot reliably aside from JSB Kings. That's how picky mine is.

Meanwhile, others are shooting various pellets and slugs without issue. And no, it's not my power settings. I tried many different settings, and the result is always the same. I also adjusted the trigger to avoid bumpfiring, and I've inspected the internals... all seems fine.

So don't be so quick to chalk it up to user error. Clearly, something is up with some of these magazines. Or else everyone would be getting the same results. Whether it's the bore size that differs slightly, or the shape of the holes is inconsistent, or some other factor.. Im not sure.
 
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steve-l said:
There is nothing wrong with the magazine. It's you! The GK1 is designed to shoot pellets, not slugs. Pellets are retained in the mag with their skirt in the small chamfer at the entrance of the mag. I have mentioned this issue many times in many other threads. Please read them. I will repeat myself again, there are no advantages using slugs in a pistol at pistol distances. In your PP700 you load to the barrel. In the GK1 you load in a rotating magazine. The barrel of the GK1 is essentially the same size as the PP700 in the same caliber of course. If you don't believe me, measure them up with pin gauges. I have.
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Good sir, this is conjecture on your part. My micrometers don't lie. You are ignoring tolerance in manufacturing, which you should know all about. I have zero issues with firing NOE 217 slugs with a 0.2205" drive band. No jamming, no looseness at around 38 FPE. I simply do not have an issue with my cast slugs.

The recovered slugs from a PP700SA when measured with a micrometer are smaller in diameter than a GK1 by 0.002". In layman's terms that makes the GK1 bore larger. I have no doubt that some of our fine colleagues on AGN are experiencing issues with fit. It's clear that there may have been either QA or manufacturing issues with some of these airguns. That, sadly is an issue with some products, it takes a while to sort out.

So tone it down, it's not always user error. Sometimes the part is out of specification. And it's not unique to items manufactured in China, as I found out on an American made slitting saw arbor. They drilled it off center. It happens.
 
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@steve-l You want to see just how much the magazines can differ in size? And the pictures aren't showing the ones that I have on my K1 or my gk1. Both fit pellets and shoot them just fine, but my K1 fits AEA pellets JUST snug, no seating needed and those have a 5.7mm skirt, which is .224! and the Gk1 doesnt need to seat them byt they don't fit snug unless I do so. Which FX and JSB pellets require seating most if not all the way in.

Both k1 and GK1 can and WILL shoot slugs, the barrels are .218 sized it's just a matter of getting a magazine that isn't too oversized. OR getting a custom mag from Kelly like this one, which is a .218 which .218 H&N slugs

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wimpanzee said:
i've tried a dozen or so pellets in mine and the clear and obvious accuracy winner is:
GTO pellets
.223 slugs under 30gr

The GTO pellets just don't do much at 50 yards tho...so I stick to the slugs! plus i think the slugs might be slightly cheaper. VK or AVS are the best ones there for me.
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You shooting the new 28.5gr .223 from VK?
 
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wimpanzee said:
those were the ones i first found to shoot really well, my current batch is some 26gr from AVS. I think the VK are a little more consistent accuracy wise....but its within margin of error for me...
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Wait are you talking about the old style with the small HP or the new XLHP? I've spoken with Dale and those measure at .2228 I've found them to shoot well out of my GK1 at 770fps and the K1 likes them at 973fps. He also has new ones, at 32.8gr.
 
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JaceSpace1369 said:
Wait are you talking about the old style with the small HP or the new XLHP? I've spoken with Dale and those measure at .2228 I've found them to shoot well out of my GK1 at 770fps and the K1 likes them at 973fps. He also has new ones, at 32.8gr.
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I'm not sure, honestly, I believe Dale sent me some of the first 28.5's he was doing, and i shot all those and another early batch, but haven't ordered any for a while, so i think it was the small HP?

After I get through my batch of AVS slugs for k1 and gk1, I'll have to try some of those!
 
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wimpanzee said:
I'm not sure, honestly, I believe Dale sent me some of the first 28.5's he was doing, and i shot all those and another early batch, but haven't ordered any for a while, so i think it was the small HP?

After I get through my batch of AVS slugs for k1 and gk1, I'll have to try some of those!
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These are the new ones, they smack hard and have a deep cavity like his normal XLHP

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I think huben has tried different sizes of mags over time to try to get to the “one size fits all” size. This is an issue with all shoot through mags. L2 has a similar issue.

The problem lies in trying to hold onto a projectile that will fit the barrel perfectly without deforming it negatively or being too hard to load.

With no standards in place, projectile diameter varies wildly.

I personally just ‘knurl’ the slugs so that they are easy to load in the mag, still are held firmly and make the transition to the bore easily (and centered squarely) during the shot. This has provided the best in terms of slug accuracy in this platform.

Smooth sided slugs are at a disadvantage with this platform. Everything has to match up perfectly for a particular size to work.

These are my experiences and apparently there are a number of variables that I haven’t/can’t address. Sometimes the stars align for some folks and for some, they don’t.

Dave
 
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Is there a definition of "dealer" and what their responsibilities might be? This hits close to home for me, prior to retirement I was a manufacturer's representative. Manufacturer's have a duty to provide service for their products. I would expect a "real dealer" to be the guy that contacts the factory on my behalf when I bring my defective product to them. I would also expect that dealer to help the customer first. The dealer likely made more dollars on that one gun than the manufacturer did. I'd also expect that dealer to be my gatekeeper as a manufacturer. A manufacturer in no way wants to deal with the buyers of their products. THAT IS WHY THEY HAVE DEALERS. The dealer should be able to tell THEIR customer that no your 2 thousand dollar rifle does not have a bad barrel, you don't know how to shoot.:eek: I propose a change that defines the dealers responsibilities succinctly. Higher end manufacturer's often do have requirements that must be met to become their dealer. The average manufacturer just wants to manufacture the guns and never hear about them again. Often the only requirement to be a dealer is often the fact that your payment checks clear the bank.
 
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