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Bryant Ridge's Analysis: The AMT AutoMag II is a semi-automatic handgun that uses .22 WMR ammunition. It was manufactured by Arcadia Machine and Tool from 1987 to 1999 and is currently produced by High Standard. Designing a reliable autoloading .22 WMR handgun posed several engineering challenges, particularly with extraction. The slow-burning rifle powder of the .22 WMR cartridge creates a late peak pressure, which can cause the case mouth to expand and jam in the chamber when fired f …