This guide details the disassembly and reassembly of the rare Osorio Selectiva .22 Rimfire machine pistol, as demonstrated by Ian McCollum of Forgotten Weapons. It covers removing the upper assembly, identifying key internal components like the telescoping bolt and dual-trigger system, and emphasizes the critical alignment of the barrel locking pin. The process requires careful attention to detail due to the unique, handmade nature of the firearm.
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