RE: Slowest FPS but still able to kill
A well placed rock thrown with your hand will kill a small bird. An air pistol in the .177 cal. will kill a bird, which would be around 500-600 f.p.s.. Some bows shoot around 180 f.p.s. and are very leathel! A well placed shot from a wrist rocket loaded with ball bearings can't be going much faster than 150 f.p.s., and will kill a small bird!!