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I have two GK1, both will fill to 32 mpa then slow leak to to around 30 mpa in a few minutes sometimes 28-29 but not often, where should I look first? Or is this something I should just live with?

I’ve searched the forums and didn’t see this discussed. My Gk1 is shooting to the left, would i move the rear sight to the right? what about the front sight? What about elevation? I’m sure this is elementary to some folks but all new to me, any help would be greatly appreciated.

I was looking to purchase some pellets, the JSB KING HEAVY DIABOLO 25 cal. 33.95, looking at the tin on the one I have the MK has a line above and below it, the ones I was looking to purchase do not have theses lines, would these be fake? Is there a difference?

What are K1 owners using and getting best results when shooting slugs when hunting game such as coyotes ? What power setting are you using? What about pellets? What perform most efficiently, what power setting are you using for the pellets? My inquiry would be about the K1 25 cal. Thanks for...

I’ve read articles about the K1 being great for taking out coyotes and watched videos saying its a go to gun for doing so. What power setting would be used? What slug would would be most effevtive? What distance could cyotes be take out at? Considering a K1 purchas, trying to learn as much as i...

Who works on the Huben Gk1 ? Looking for a possible optio.

I sent my Gk1 back to New England Air because it wouldn’t take air, last Saturday their tech called me and said the valve had jammed, that it was not user error and it sometimes happens, the pistol was now working great. I received it today, it had no air in it, I tried to fill it with air and...

Does anyone have one, what are your thoughts on the rifle.

I’ve had my Gk1 four days and now it won’t take air, it had been doing really well. Yesterday I shot twelve rounds at full power without issue, I had 7 mpa of air left, when I got home I noticed the air was gone. I then tried to refill the pistol and it wont take air. I contacted New England Air...

I recently purchased the Hammer and have been sighting it in using the 550 grain slug. I have very good accuracy at 25 and 50 yards, however at 75 and 100 yards there is significant drop with the 550 slug. Anyone else using the 550 slug? For longer distances should I go to a 350 slug?