A very fair 300euro but as its all in German that may have been a wholesale price .
It was advertised in this catalogue as a Browning AirStar and btw along with an airpistol called Browning 800 Mag - looks like a Diana Lp8 break barrel .
Sound reduction - no idea man - am no expert in engineering but dare say the cocking sound would be the same . The recoil noise would be reduced but I don't think the sound of cocking the thing would differ ...