This mag has a really useful feature!. You can switch between 30rnd, 60rnd & 120rnd capacity by simply removing the mag internals via the bottom of the mag, then inserting the pin into the corresponding hole for the desired capacity..simples ! Zero One Airsoft,Airsoft,Air Soft,Dorset,Hampshire,softair,,120 Rounds,30 Rounds,60 Rounds,Airsoft,Bb Gun,Fa Mas,Famas,Low Capacity,Low-capacity,Magazine,Mags,Mid Capacity,Mid Caps,Mid-capacity,Midcaps,Pellet,Softair,midcaps,,Cybergun,Adjustable,Capacity,AEG,Mag,for,FA-MAS,30,60,120rds |