Lyman's Ammo Checkers check the quality and consistency of both reloaded rounds and purchased ammo. A must for any auto shooter for easy and consistent feed. You can't afford misfeeds, so get the easiest "no-go" gauge available today! Lyman's multi-caliber Ammo Checkers have been extremely popular with reloaders. Now based on demand from customers, Lyman is adding gauges having 8 chambers with all being of the same caliber. These gauges allow reloaders to take multiple cartridges right off the press and check them as they go. If they fit, they will chamber in your gun. Like the multi-caliber blocks, they are machined from solid 6061 aluminum and cut with custom tooling to SAAMI minimum chamber tolerances. A must for any semi-auto shooter, these easy to use “GO” gauges ensure the quality and consistency of your reloaded ammo. Specifications: - Cartridge: 223 Remington - Material: 6061 Aluminum - Quantity: 1