A firearm magazine with loading status indicator. the magazine comprising a housing (1) for storing bullets in a stacked configuration, with an opening (6) for receiving the bullets (5); a follower (3) for supporting the bullets within the housing, movable along the housing and resiliently pressing towards the opening, so that at any time, when there exist at least one bullet within the housing it is presented at the opening, ready to be discharged; an indicator having a prominence (7), which in one indication state the prominence protrudes outside the housing and in another indication state the prominence does not protrude outside the housing, wherein one of the indication states corresponds to a state where the magazine is in a full condition, that is when it is filled with bullets up to a maximal capacity, and another indication state corresponding to a state where at least one bullet is missing with respect to full condition.