The Umarex Legends M3 Grease Gun Spare Magazine is a must-have accessory for keeping the action going. Designed specifically for the full-auto M3 replica, this magazine holds 60 rounds of .177 caliber steel BBs and houses two 12g CO2 cartridges for maximum power and performance. Whether you're practicing target shooting or enjoying rapid-fire fun, having an extra mag on hand means less reloading and more shooting. Built tough to match the feel of the original, it's the perfect companion for your Legends M3 Grease Gun.