GAMO SWARM MAGNUM PRO GEN3I INERTIA AIR GUN .177 CAL. This .22 multishot pellet air rifle features Gamo’s most powerful technologies, the 33 mm cylinder and the IGT Mach 1, with 1,300 fps in .22 caliber. That combined with the 10X GEN3i inertia fed technology and the Whisper Fusion technologies, makes the Gamo Swarm Magnum 10X GEN3i a revolutionary break barrel. Every Swarm Magnum 10x GEN3i .177 multishot pellet air rifle includes 10-shot magazine. It also includes a Gamo 3-9×40 scope (with a one piece mount).