The Sig Sauer P320-M17 Series .177 Caliber 20-Round Air Magazine is a factory replacement magazine designed specifically for the Sig Sauer P320-M17 ASP CO2 pellet pistol. This black, drop-free magazine features a patented 20-round rotary pellet belt that ensures reliable feeding. It is engineered with an integrated CO2 housing, utilizing a cam-lever loading system that allows for quick and toolless 12-gram CO2 cartridge changes without losing stored gas upon ejection. Constructed from a durable blend of metal and polymer, it mimics the weight and balance of the firearm's standard magazine for a more realistic training experience.