If you use pellets, the manufacturer suggests that you use only wadcutters.

• 90-Day Limited Warranty
• Uses a 12-gram CO2 cartridge
• 16rd removable pellet and BB magazine (stick mag with 8rd rotary mag on each end and accepts either lead pellets or steel BBs)
• Blowback
• Rifled barrel
• Looks like the firearm
• Fixed sights (2 whited dots on rear sight, 1 white dot on front sight)
• Manual safety
• Weaver accessory rail
• Threaded muzzle

Specifications:

• Loudness: 4-Medium-High
• Weight: 1.60 lbs
• Barrel Length: 3.80″
• Overall Length: 8.20″
• Barrel: Rifled
• Action: Semiautomatic