The VKS Carbine features a Dual Feed System that offers the ability to quickly switch between Hopper mode and Magazine mode for optimum versatility. It offers a MIL-STD-1913 rail platform, machined upper, and lightweight polymer lower. Compatible with both standard round projectiles and VXR projectiles. Dual air source: HPA butt-stock 13ci tank or remote airline to tank of choice. Hopper capacity of 180 rounds, hopper feeds 20+ PPS (Projectiles Per Second). Magazine capacity of either 10 or 15 rounds. No recoil, flip safety switch, SplitShot compatible, maximum range of 150 ft.