Spare magazine with a capacity of 19 steel BBs 4.46 mm, dedicated to the Glock 17 Gen 4 4.5 mm air pistol with blowback system.
The magazine body is made of metal, while the base plate and the locking BB follower are made of polymer. Inside the magazine there is a compartment for a CO2 capsule.
The magazine holds 19 steel BBs.