Even though the components for modifying Huben K1 are included with the purchase, you are not allowed to modify it on your own. In Germany, only a gunsmith is allowed to do so. At that moment they create an air gun that requires a license. If you don’t have a license, then you are not allowed to own the gun.
I have luckily found a gunsmith who will do rebuilds on rifles for me and is not camera-shy. Michael Rumpel from Opferbaum in Bavaria is the gunsmith I rely on. Besides his craftsmanship, the great thing is that he also has a 100 meter shooting range that I get to use for my videos. That’s great for me, my website and my YouTube channel. I can then immediately test all the modified rifles.
The rifle has a high-quality synthetic stock. The fixed Picatinny rail is, just like its mount, made of metal. I have to admit, the air rifle feels and actually looks much more high-grade than I had previously suspected from the photos I had seen. I was afraid that it would be rather cheap. The workmanship is excellent as well. So far, I haven’t noticed a gap or a sharp edge anywhere.