The Lyman Case Length Headspace Gauge 9mm Luger (Model: LY-CG9MM) is a precision-engineered quality control tool designed for metallic cartridge reloaders who require absolute consistency and safety. This one-piece, non-adjustable cylinder-type cartridge case gauge is machined with specialized reamers to ensure exact SAAMI-standard tolerances, rather than standard chamber reamers. By inserting a processed case or a completed 9x19mm Parabellum round into the gauge, reloaders can instantly verify if their ammunition meets correct headspace and case length dimensions, ensuring smooth chambering and reliable cycling in any standard 9mm firearm.

Key Features:

• Dual-Function Verification: Allows reloaders to quickly check both the minimum/maximum headspace limits (base to datum line) and the maximum allowable case length in one simple step.
• Chambering Reliability: Instantly identifies physical defects such as body bulges, improper crimps, or damaged case rims that would otherwise cause feeding malfunctions or jams during live fire.
• Simple Go/No-Go Operation: Features precision-machined steps at the top and bottom. If the cartridge sits flush within these steps, it is safe to use; if it sits too high or too deep, it indicates a sizing or trimming issue.
• Enhanced Safety: Helps prevent dangerous high-pressure situations and catastrophic case separations by ensuring brass is sized within safe operating limits.
• Brass Longevity: Helps reloaders avoid over-working their brass during the resizing process, extending the overall reloadable lifespan of 9mm cartridge cases.
• Zero Maintenance Design: Manufactured as a solid, single-piece mechanical tool with no moving parts or power requirements, ensuring lifelong durability on the reloading bench.

Specifications:

• Brand: Lyman
• Model: LY-CG9MM
• Calibre Compatibility: 9mm Luger (9x19mm Parabellum / 9x19mm)
• Gauge Type: One-piece, non-adjustable cylinder cartridge case gauge
• Product Weight: Approximately 90 grams (0.20 lbs)
• Packaging Dimensions: Approximately 11.0 cm x 6.4 cm x 3.6 cm (4.35 inches L x 2.50 inches W x 1.40 inches H)
• Power Requirements: None (fully manual mechanical tool; SAA/RCM electrical certifications and 240V compatibility are not applicable)

Who It's For:

This tool is highly recommended for Australian sport shooters and handloaders, particularly those competing in high-volume handgun disciplines such as IPSC (International Practical Shooting Confederation) and Service Pistol. Because semi-automatic pistols require highly consistent ammunition to function without jamming, this gauge is an essential safety accessory for anyone reloading 9mm Luger. It is also an invaluable asset for Australian hobbyists who want to ensure their handloads strictly comply with state-based firearm safety regulations by maintaining precise SAAMI dimensions.