Brand: StopBox USA
Model: Shotgun Chamber Lock Pro (SB231B - Black)
Intended Use: Home defense and secure staging; prevents unauthorized cycling or discharge while keeping the firearm "staged and ready."
Firearm Type: Most 12-gauge pump-action shotguns
Entry Type: All-mechanical hand gesture code lock with 81 possible combinations.
Battery Size: None; it is a battery-free mechanical design.
Mounting Type: Portable/Chamber-mounted; installs directly into the ejection port/chamber.
Firearm Capacity: 1 Shotgun.
Proofs/Resistances: Tamper-resistant and built for high-strength firearm retention.
Interior Material: Machined 6061-T6 Aluminum.
Outer Material: 6061-T6 Aluminum with Type II/III Hard Anodizing.
Finish: Black Hard Anodized
Exterior Dimensions: Approximately 3.25" x 2.25" x 1.75".
Includes: One Chamber Lock Pro, six preset configurations, and a quick-release cable door.

Features

The StopBox USA Shotgun Chamber Lock Pro is a fast, non-invasive firearm safety solution designed to help secure shotguns during storage, transport, and display. Engineered to fit most 12 gauge pump-action and semi-automatic shotguns, this chamber lock blocks the action from closing and provides a highly visible indication that the firearm is secured and unloaded. Its durable construction and tool-free installation make it ideal for responsible firearm owners looking for quick and effective firearm safety storage options. Built for convenience and reliability, the StopBox Shotgun Chamber Lock Pro features a rugged design that resists tampering while remaining easy to install and remove when authorized access is needed. The bright, highly visible design allows for rapid visual confirmation of safe firearm status, making it useful for home storage, range transport, hunting camps, and training environments. Whether used as part of a larger firearm security setup or as a standalone safety accessory, the StopBox USA Shotgun Chamber Lock Pro offers dependable peace of mind for shotgun owners.

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