I have one of the very few SK-19 rifles made in .177 caliber.
I love mine, it’s very accurate and I use it strictly for pest control, I never shoot it in full auto, it’s a worthless activity and risks breaking the unrepeatable rifle.
The semi auto on the other hand is fantastic, I can kill a lot of pests with 19 shots without cocking or reloading.
The disadvantage comes when it’s time to reload, it takes a long time to reload 19 pellets, 4 at the time, seating each properly but not too far forward in order to prevent a jam.
I haven’t had any jams or problems yet.
Sooner or later it will break and that’s when I’ll stop loving it, can’t get parts for it, maybe some Rattler or Sidewinder parts may work but neither Airguns of Arizona or Western Airguns will tell you if they would, basically once my rifle breaks down, it’ll be the end of it, it’ll just be a show and tell item, it’ll just look good on a wall rack.