I prefer Huben K1/ .22 cal 2021 - semi-auto, lightweight, powerful/ up to 80 fpe in .22 cal, adjustable very easy just with one wheel from 300 to 1200 fps depending of ammo/ eats a JSB pellets + .223 slugs (saw a squirrel - three clicks clockwise, met a coyote - six clicks back, etc.!), 19...