Got the compact P II with a 500 cc bottle turned down to 80 bar on the Reg , Shooting the 10 gr JSB pellets at 695 to 700 FPS , Yes it seems to take the sparrow POP away its just that much quitter, Most shots are at 35 to 48 yards , and some of the little farts bleed pretty bad. Oh yes these are baited and grain fed sparrows ,. I buy 50 lbs of chicken scratch for all the good birds at the pest sparrows keep coming back for a free meal ,,