Product Description PROFORCE M18 Magazine Complete 6mm Caliber 21 Round Green Gas Housing Other Details Airgun Energy System: Green Gas Airgun Caliber: 6mm CA Prop 65: Yes Available Drop Ship Delivery Options: economy|next_day_air|second_day_air|ground Allocated Item?: No Color: Flat Dark Earth Airgun Capacity: 21 Airgun Accessory Type: Magazine Brand: Sig Sauer