Firearms Unknown is a firearms retailer with physical stores in National City and Oceanside, California, and Yuma, Arizona. The company sells a broad range of products, including rifles, pistols, shotguns, ammunition, knives, optics, suppressors, firearms parts, and accessories. Its inventory also includes tactical gear, targets, cleaning supplies, apparel, books, and other shooting-related items.

Shoppers can browse complete firearms as well as components and build-related products, with selections from brands such as Glock, Ruger, Mossberg, Holosun, Trijicon, and Vortex. The retailer highlights California-legal firearms and offers custom shop services, alongside firearms classes and training. Its website features sale items, package deals, and a garage-sale section, and provides online shopping with shipping and integrated inventory information.

Firearms Unknown also publishes articles and announcements covering firearms, training, and related industry developments. Customers can visit its listed retail locations or contact each store by phone for details. The company accepts major card payments and states that Bitcoin and other alternative cryptocurrency payments are available