A system for mounting a plurality of tactical attachments to firearms is disclosed. Tactical attachments such as laser illumination sights, flashlights, bayonets, and breaching tools are interchangeable and attached with a single adapter mounted to the end of a magazine ammunition tubes and auxiliary accessory rails such as Picatinny rails. Adapters of varying lengths provide increased ammunition capacity. The tactical attachments have a common mounting structure for mating to the adapter, which includes a optional locking ring to assure the tactical device cannot become dislodged from the adapter during firearm usage. The adapter/tactical device interface allows rapid swapping of tactical devices without the need of tools. Tactical attachment lighting devices such as flashlights and laser sights are provided with wireless remote turn on/off and lighting mode switching capability.