Designed with Milsig Heatcore™ system, polymer/metal composite lightweight receiver, stockless design with external HPA Tank, achieving perfect balance of capacity and portability.M17SpecificationsLength: 500mmWeight: 1790gCaliber: .68Ammo: .68 PaintballPower Source: HPAManuals[EN] MILSIG Modular Blaster System (MMBS) Introduction [EN] HPA Blaster 101 [EN] M17 Series User Manual