This specific configuration of the 590 shotgun features a heavy-walled barrel, metal trigger guard and safety button, and, notably, a bayonet lug. This allows for the attachment of a bayonet, transforming the firearm into a close-quarters combat weapon.
The enhanced durability of the 590A1 platform, combined with bayonet compatibility, makes it a popular choice for military, law enforcement, and security applications where a robust and versatile firearm is required. Historically, bayonet attachments have provided an important edge in close combat, offering an immediate offensive or defensive capability when ammunition runs low or engagements occur in tight spaces. This enduring practicality continues to inform the design of certain modern firearms, ensuring their effectiveness in diverse operational environments.