One thing to keep in mind, the Sidewinder is a much bigger and heavier gun than the Huben. I’ve got the Sidewinder in .30 and the Huben in .22. They’re both very impressive guns, but if my sidewinder were suddenly changed to a .22 tomorrow then I would pick the Huben over it hands down.
Both guns are super accurate. 1/2” groups at 50 yards are common with both rifles. The trigger on the Huben is about an 8 out of 10 and the trigger on the Sidewinder is about a 7. They are both very good triggers, but they’re not in the same league as what you’d get on an FX or Air Arms. The Sidewinder trigger is a little longer and a little heavier than the Hubens, but still quite good.
The Huben is much smaller, lighter and much quieter out of the box. The sidewinder in .30 is not backyard friendly regardless of the power level until you start modifying the shroud and adding large aftermarket cans. The Huben is somewhat backyard friendly out of the box and if you dial down the power it becomes pretty quiet. If you’re shooting slugs at 70 fpe it’s going to need a can. If you dial it down to 12 fpe no one is likely to notice you’re shooting it.
The Huben is also a much more attractive rifle, for whatever that is worth to you. With a wood stock it looks downright good. The Sidewinder looks like a plumbing tool crossed with an AR.
The Sidewinder has removable magazines and IMO that’s a huge plus. Just pop the mag out and there is no way the gun can fire. It’s akin to removing the cylinder from a revolver. They’re also easier to load.
The Sidewinder also has full-auto capability and a second safety right where it belongs. The Huben only has one safety back by your shoulder and on the wrong side.
I really think full auto would be much better in .22 as well. In .30 there is just too much recoil to hold the gun accurately on target while firing a burst. Sure you can do it, but instead of 1/2” groups at 50 yards you might be getting 5” groups.both the huben k1 and sidewinder ate 7.7 lbs so not sure how sidewinder is bigger and heavier. You may be mistaking it for