Modular shotgun box magazine

A system of a modular magazine for a shotgun, the system comprising:

• a first upper portion of a magazine having a first interior, an upper end of the first upper portion is configured to mate with a receiver of a first shotgun;
• a first lower portion of a magazine having a second interior;
• a first plurality of fasteners to selectively connect the first upper portion to the first lower portion, the first interior and second interior form a cavity configured to hold a first number of shotgun shells.

A modular magazine component comprising an upper portion having an interior, an upper opening, a lower opening, and a lower flange, wherein the lower flange is configured to separately connect to a first lower portion to form a first magazine configuration and separately connect to a second lower portion to form a second magazine configuration, wherein first magazine configuration holds a different number of shells than the second magazine configuration.

A modular magazine component comprising a lower portion having an interior with an upper opening and an upper flange, wherein the upper flange is configured to separately connect to at a first upper portion to form a first magazine configuration and to separately connect to a second upper portion to form a second magazine configured, wherein the first upper portion includes a first upper end to engage a first shotgun receiver and the second upper portion includes a second upper end to engage a second shotgun receiver, wherein the first upper end cannot engage the second shotgun receiver and the second upper end cannot engage the first shotgun receiver.