This HK 416 .177 magazine holds a maximum of 36 steel BBs and only fits the Umarex HK 416 air rifle. The majority of the space inside is dedicated to housing two 12 gram CO2 canisters, providing enough air to fire many magazines.In addition, a CO2 piercing key is included. With this component, the CO2 canisters can release air as you pull the rifle trigger.Having 36 BBs is enough for six bursts. However, the BB reservoir in the handguard can constantly refill the magazine. All you need to do is turn the rifle at an angle to drop more into the magazine.

Features:

• Compatible with HK416 .177 caliber air rifles
• Designed to hold (2) 12 gram CO2 cartridges
• Includes CO2 piercing key for easy cartridge installation