For Milsim players who do not want to buy too many magazines to meet the requirements of milsim events of either low-cap or mid-cap magazines, here is something from KWA Performance Industries, the KWA K120c AEG Magazine that has the 30/120 round cut-off feature... "Dominate the field with the new KWA K120c Magazine. It features a 30/120rds cutoff & manual switch on its base.