[Set] M923A DEK762 7.62 / 300 BLK ETU Airsoft Rifle - Black [Double Eagle] + 220RD Mi-Cap Magazine for AR15/M4/M16 - Black [DE]

Mid-cap magazines must be prepared in a particular way before the first usage.

Steps that must be made:
during the first usage, magazine MUST NOT be fully loaded with bbs,
before the first usage, magazine SHOULD be oiled with silicon oil for better working,
during the first usage, magazine SHOULD be loaded with few bb s and subsequently core out. After magazine SHOULD be loaded with 10 bbs more than the first time and subsequently core out. Activity *SHOULD* be repeated until full mag capacity will be achieved.
REMEMBER if a magazine is stored, it MUST be empty,
REMEMBER to regularly oil the magazine with silicon oil.

After performing this procedure, you will get access to the manufacturer's declared capacity. And the magazines will feed much more smoothly.