Abstract: A quick loading firearm magazine generally comprises; a magazine casing, a chambering mechanism, and a chambering mechanism actuator. The magazine casing is configured to receive a plurality of firearm cartridges and the casing is dimensioned to couple to a magazine well of a firearm. The chambering mechanism, such as a spring, provides a sufficient force to loaded firearm cartridges to assure the cartridges are chamberable within the firearm, and may further comprise a spring follower coupled to the spring to further assist guiding the loaded cartridges. The chambering mechanism actuator allows a user to manually actuate the chambering mechanism and may comprise a casing slide that suitably engages the casing, and is configured to; slide along the firearm magazine body, engage the spring follower through a longitudinal casing slot, and maintain the spring follower in a substantially normal position relative to the casing sidewall.