Designed with Milsig Heatcore™ system, polymer/metal composite lightweight receiver, 5-position extendable stock allowing you easily adapt to the ever-changed battlefield.M17A1SpecificationsLength: 525~715mmWeight: 2340gCaliber: .68Ammo: .68 PaintballPower Source: HPAManuals[EN] MILSIG Modular Blaster System (MMBS) Introduction [EN] HPA Blaster 101 [EN] M17 Series User Manual