The Lyman MSR Multi-Caliber Ammo Checker Block is an essential tool for any shooting enthusiast. Crafted from durable aluminum it ensures precision by verifying the quality and consistency of your ammunition. Designed to accommodate a range of calibers including 5.56 6.5 Grendel 7.62x39 and more this ammo checker is perfect for both hand-loaded and factory rounds. Its meticulously machined design guarantees that your ammo meets minimum chamber dimensions providing peace of mind and enhanced reliability in your shooting experience.