Ensure your 5.56 NATO ammunition meets precise chamber specifications with the Evolution Gun Works 5.56 7-Hole Ammo Chamber Checker. This professional-grade case gauge helps reloaders and shooters quickly verify that factory and handloaded rounds will chamber reliably in your firearms, reducing the risk of malfunctions and improving overall safety and performance. Key Features Precision-machined construction from solid 6061 T6 aircraft-grade aluminum for exceptional durability and accuracy 7-hole design allows simultaneous checking of multiple cartridges to streamline your reloading workflow SAAMI minimum specifications cut using Clymer reamers to match true chamber dimensions for 5.56 x 45mm NATO Matte black anodized finish provides corrosion resistance and a professional appearance Checks critical dimensions including minimum case diameter and maximum overall length Specifications Caliber: 5.56 x 45mm NATO Holes: 7 Material: 6061 T6 Aluminum Finish: Matte Black Anodized Weight: 2.4 oz Dimensions: 3" L x 1.25" W x 2.26" H Benefits for Reloaders and Shooters Manually inspecting every round is time-consuming and prone to error. This chamber checker solves that pain point by providing a fast, repeatable method to confirm your ammo will fit properly, helping prevent dangerous out-of-battery detonations or feeding issues. Its compact size makes it ideal for bench use or range bag transport. Unlike generic gauges, EGW's design is specifically engineered for the longer throat of 5.56 NATO chambers, ensuring compatibility with both military-spec and commercial loads. Why Choose the EGW 5.56 7-Hole Chamber Checker Built by a trusted manufacturer of precision reloading tools, this gauge delivers consistent results reload after reload. Whether you're processing bulk factory ammo or fine-tuning handloads, it offers the reliability needed for tactical, competition, or defensive applications.