Ambidextrous push-button magazine release for side-locking ammunition magazines

A firearm for use with a magazine having a side-locking recess, the firearm comprising:

• a body having a magazine well configured to operatively receive a magazine, having a side-locking recess with the side-locking recess within the magazine well with the magazine operatively received therein;
• and
• an ambidextrous magazine release comprising:
• a linkage movable between an engaged position and a disengaged position having a lock pin configured to be received in a side-locking recess of a magazine operatively received in the magazine well with the linkage in the engaged position and to clear the side-locking recess with the linkage in the disengaged position;
• a one-piece actuator on the firearm, the actuator comprising a bar having opposing push surfaces extending between a right and a left side of the firearm;
• and
• an interface between the linkage and the actuator, the interface being configured so that as the either of the opposing push surfaces of the bar is pushed by a user, the linkage is moved between the engaged and the disengaged position;
• wherein the linkage interface comprises a recess in the bar defining a pair of converging cam surfaces and a cam rider extending from the linkage into contact with the cam surfaces, the linkage being in the engaged position with the cam rider at the convergence of the cam surfaces.