How to Properly Measure Barrel Length Presented by Larry Potterfield | MidwayUSA Gunsmithing
This video provides a comprehensive guide to accurately measuring firearm barrel lengths, crucial for compliance with the National Firearms Act (NFA). Larry Potterfield demonstrates the official ATF procedure using a dowel rod, explaining the specific techniques for break-open shotguns, pump/semi-auto shotguns, rifles, revolvers, and semi-auto pistols. Understanding these precise measurement points ensures legal compliance and proper firearm identification.









