I've owned both the .22 and the 9mm Career 707 lever action air rifle.
they were both powerful (got 1200 FPS using 28 gr pellets out of the .22 and 850 FPS using 76 gr pellets out of the 9mm.
the .22 was used and had been tuned by somebody, it shot great was very accurate.
the 9mm was brand new purchased from pyramidair.com, and the bore was black as coal.
i put at least 100 swabs through it and they still came out black, the gun couldn't hit anything accurately because the bore was so dirty.
Both were LOUD, I'm taking louder then any rimfire I've shot.
I finally sold both and now use a rimfire and either Aquilla SSS up to a CCI velocitor depending on if I want a quiet back yard pest control or a reach out and touch a pest