Abstract: Positional adjustment of a firearm magazine spring is supported by various instrumentalities. A magazine housing has therein a locking assembly carried on the magazine spring and cooperable with a sidewall of the housing to releasably lock the spring to the housing. Contact portions that engage the spring and permit application of compressive force to the spring are provided variously as part of: an apparatus separate from a firearm; a magazine well of a firearm; and a magazine insertion opening in a firearm that is separate from a magazine well of the firearm.

Abstract: A firearm magazine housing contains a spring to forcibly urge a follower with ammunition rounds stacked thereon toward an open end of the housing, thereby to facilitate delivery of the ammunition rounds into the firing chamber of a firearm. By a positional adjustment of the spring, the urging force that the spring applies to the follower during loading of ammunition rounds is reduced.

Abstract: A firearm magazine housing contains a spring to forcibly urge a follower with ammunition rounds stacked thereon toward an open end of the housing, thereby to facilitate delivery of the ammunition rounds into the firing chamber of a firearm. By a positional adjustment of the spring, the urging force that the spring applies to the follower during loading of ammunition rounds is reduced.

Abstract: A firearm magazine housing contains a spring to forcibly urge a follower with ammunition rounds stacked thereon toward an open end of the housing, thereby to facilitate delivery of the ammunition rounds into the firing chamber of a firearm. A follower support apparatus disposed within the housing supports the follower for movement in the housing, and permits the ammunition rounds to be stacked onto the follower independently of the spring.