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Understanding Firearm Serial Numbers & Markings: What They Mean, Where to Find Them, and Why They Matter Look closely at almost any firearm and you’ll find a mix of letters, numbers, and symbols: a serial number, a model name, a caliber marking, importer information, and sometimes small stamps that look like code. These markings aren’t decoration—they help identify the firearm, document its origin, and communicate basic information to owners, dealers, and service profession …