|.43 caliber/11mm only! T4E factory Spare Magazine for the TM4 Walther PPQ CO2 Paintball pistol. Rugged molded composite polymer construction. Holds 8 paintballs and a 12 gram CO2 cartridge. The TM4 .43 caliber Walther PPQ is the most realistic Paintball pistol on the market! It will accept .43 caliber Paintballs, dust balls, rubber balls and pepper balls, and fits into any standard holster. Designed for cost-effective military; security and law enforcement training.