Huben Shot my first shot in GK1, and the air is now empty & pellet jammed, unable to rotate mag

airvalley818 said:

Got the Huben GK1, .25, V3, Unregulated.

Had some air in it, and loaded in the pellets. Went to do a test shot, and it emptied out all of the air, and now I cannot shoot, pellet is jammed (I assume), and I can't rotate the magazine any more. (That is also jammed).

Why did it empty out the gas? How can I fix the jam? Any insight?

Pellets were seneca, .25

Click to expand...

I've had that happen. It's picky with ammo you will notice it will never do that with certain ones. To get it unjamed I tapped the projectile back into the mag with a cleaning rod from inside barrel wiggle to mag to line it up if needed. Empty the pellets front the mag and try 34 grain FX /diobolo pellets

This happened to me a few times. Here is how I fixed the problem.

1. Put the safety on!
2. Completely degas the gun. There are a few YouTube videos showing how to do this. A jam typically let some air out, but not necessarily emptying the air reservoir.
3. Remove the shroud using a 7mm hex key to remove the end-cap. Then slide the shroud off.
4. Remove the grip using a 4mm hex key.
5. Remove the linkage from the trigger blade to the actual lever that fires the gun, this one needs a 2.5mm hex key.
6. Remove the whole trigger blade group, including the trigger guard using 4mm hex key.
7. Make sure all the air is let out from the reservoir!
8. Rotate the reservoir and slide it out.
9. Use a 3mm hex key to loosen (not to entirely unscrew) the bolt at the bottom of the receiver assembly that clamps on to the part where the air reservoir slide out of.
10. Use a 2.5mm hex key to unscrew only the top two bolts facing forward (muzzle end).
11. Slide the barrel-magazine assembly out.
12. Wiggle the magazine out of the bearing hub. Note the orientation.
13. Remove any projectile that is stuck.
14. Reverse the whole process.

The jam can be due to a few reasons. The projectile being used has a loose fit, forgetting to put the magazine rotation release level back in position are probably the most common reasons.

There are probably several YouTube videos showing how to do this.

airvalley818 said:

Got the Huben GK1, .25, V3, Unregulated.

Had some air in it, and loaded in the pellets. Went to do a test shot, and it emptied out all of the air, and now I cannot shoot, pellet is jammed (I assume), and I can't rotate the magazine any more. (That is also jammed).

Why did it empty out the gas? How can I fix the jam? Any insight?

Pellets were seneca, .25 cal

Click to expand...

Do you remember the pressure ? most likely was to low.

Devink said:

I've had that happen. It's picky with ammo you will notice it will never do that with certain ones. To get it unjamed I tapped the projectile back into the mag with a cleaning rod from inside barrel wiggle to mag to line it up if needed. Empty the pellets front the mag and try 34 grain FX /diobolo pellets

Click to expand...

In terms of using the right ammos, @Devink is correct! The following ammo types have worked well for me:

1. JTS 22gr .22 pellets (harder lead alloy, stout pellet)
2. HN Field Target Trophy Green lead-free .22 pellets (<9.6 gr!)
3. GTO .22 lead-free pellets (expensive)
4. AVS 22gr .223" slugs (2 MOA groups out to 100 yards!)

Many ammo types do not work well. Pellets that use soft lead and have thin skirts do not work very well. JSB Jumbo RS gave me a lot of grief.

So far i have without hitch shot jsb and fx pellets (24ish and 34ish grain). Also no issues with h and n field target pellets and properly sized 50 gr bbt slugs. Haven't done comparative accuracy yet - shooting spinners and cans

Jams, I have owned several Huben K-1's and 2 GK1 and have worked on several.

I for one as well as my friends never push the projectile in further other than how ever far it goes in with thumb.
Another thing is usually the reg. pressure setting has to relate with the power wheel setting.
Loose pellets or to small diameter projectiles will be an issue.
I have shot Crossman Premier, JSB, AVS, NELSON with no issues.

airvalley818 said:

Got the Huben GK1, .25, V3, Unregulated.

Had some air in it, and loaded in the pellets. Went to do a test shot, and it emptied out all of the air, and now I cannot shoot, pellet is jammed (I assume), and I can't rotate the magazine any more. (That is also jammed).

Why did it empty out the gas? How can I fix the jam? Any insight?

Pellets were seneca, .25 cal

Click to expand...

Although others provided an answer, here is a great simple video showing the typical ways to fix it if that occurs; yes the pistol is picky about the ammo but if you use the right ammo and have the FPS not too low it is unlikely to jam. I am trouble free with over 2000 rounds with not one issue. Also hold the grip firmly, if you do not it could cause you to do a double shot, you can increase the tension if you prefer. For me I liked how it came but you cannot loosely hold it.