Springfield Armory Hellcat Pro CO2 BB Pistol Semi-auto Metal slide Optic cut (adapter plate included) Available in Black or Flat Dark Earth (FDE) Accurate ergonomics Single/Double Action Blowback CO2 Powered Uses 12 gram CO2 cartridges Shoots .177 caliber BBs 17 round drop-free magazine Fixed front and rear sights Manual safety Max velocity: 390 FPS Barrel length: 4.3" Overall Length: 6.5" Weight: 1.25lbs Tech Tip: The Hellcat Pro BB Pistol may not fit all holsters designed for the firearm.