I just got a Evanix S10 from them. It packs a good punch and isn't much louder than the suppressed Benjamin Marauder. The Koreans did a good job on the baffle design. I have been a collecter of airguns for years:>)
That looks like a beautiful gun. The stock and checkering look nice. Didn't know it was Korean. I wouldn't want to buy anything from China, even it was good. The Chinese copy designs they stole from someone else, usually the Germans.
I'm an airgun fan from way back. Can you believe that airguns were illegal in NJ when I was growing up? I had a couple anyway, hehe.
I know someone who has an antique (prob. 19th cent.) springer with a revolving cylinder, which is what many modern PCP repeaters use, only on this antique I think you advanced it by hand, separately from cocking the gun. The former owner had other neat stuff, like at least 2 air canes.