Gamo Swarm Bone Collector is .22 Caliber and 975 fps with IGT gas piston. Includes 10X Quick-Shot System and Whisper noise dampening technology. Patented polymer jacketed steel barrel and 4X32 scope included. Comes with Gamo RRR scope rail and Smooth Action Trigger. SWA recoil pad and high quality beechwood stock are included.