Sig Sauer MCX BB Series 4.5mm 30rd Dual CO2 Air Magazine AMRC-BB-MCX-30

The Sig Sauer MCX BB Series 4.5mm 30-Round Air Magazine is a factory replacement magazine engineered specifically for the Sig Sauer MCX Rattler CO2 BB air rifle. This full-size, drop-free black magazine has a capacity of 30 steel BBs (4.5mm / .177 caliber) and is constructed from a rugged blend of polymer and composite materials. It functions as a dual-purpose unit by both feeding the ammunition and housing the single 12-gram CO2 cartridge required to power the air rifle's internal blowback action and firing modes.