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This product called Chamber Checkers is designed to help shooters avoid malfunctions caused by ammunition that does not meet specifications. It can identify issues like jams, feeding problems, misfires, and other concerns. This product works for both factory loaded and reloaded ammunition, and it is recommended to check ammo before shooting to ensure it is within spec. These checkers come with 7 holes and made from high-quality materials like 6061 T6 aircraft grade aluminum that is machined to perfection. Additionally, they use Clymer reamers to ensure perfect ammo-to-chamber compatibility. The checkers can measure the minimum case diameter as well as the maximum overall length of ammunition. Lastly, the anodized matte black provides durability and an elegant finish.