The magazine can hold 26 rounds. The real Sig Sauer P226 has various magazine variants, holding 10, 12, 13, 15, 17, 18, or 20 rounds; depending on bullet type and magazine size. Therefore, you can use the WE F226 magazine to emulate any of the real firearm magazine by loading the same amount of rounds as the real magazine. Nice thing about the GBB magazine is that all BB rounds in the magazine will fire, unlike an AEG magazine where some rounds will be wasted.