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I'm just going to try and force the screw to turn. According to an email response from Hatsan, you need to do it just like the second video. My screw doesn't want to turn, but I guess I really need to crank that sucker. I'm not looking to do crazy modding to the thing.

That forum won't allow me to use the search. I'll try to find it another way I guess.

Maybe the .25 can't be tuned? I have a chronograph now, and it makes no difference what I do. I can turn the thing all day clockwise -- nothing happens to the fps.

I have a Hatsan AT44-10 QE Long .25 that I'm trying to tune down the power. I've tried using Airgun Web's method on YouTube (https://youtu.be/QrNgOqfIqLs?t=4m). That method didn't make a difference from what I can tell. Then I tried this method (https://youtu.be/ag2ziKYvnqA?t=36s). The problem...

Thank you to everyone who replied! This has been very helpful. :-)

The manual for the Hatsan 150 says to "oil you air rifle every 250 shots". I dunno exactly what that means, so I tried searching the web. The info I've found for Gas Pistons were mixed opinions. Some people would say to only oil the breech seal. Some people would say to open the breech and oil...

I had some silicone oil that I used a tiny amount applied to a patch, then pulled through the barrel. After that, I pulled a few dry patches through, and wiped up any manufacturer oils I could see. I think the pellet must have gotten stuck in the chamber and didn't allow the pressure to release...

Bought a Hatsan 150, I shot about 25 pellets through it, then did a barrel clean to get all the factory gunk out. I had noticed a very mininal increase in power, and an increase in accuracy after cleaning. That was going to be the only cleaning until I felt the accuracy was dropping. After about...