This guide details the disassembly and functional explanation of a custom-built, real-life replica of the Halo M90 shotgun's trigger mechanism, as presented by Ian McCollum of Forgotten Weapons. The mechanism is built upon a left-handed Remington 870 Wingmaster receiver, modified for top-loading and bottom-ejecting. The complex multi-stage camming linkage translates the trigger pull to the original sear, engineered for safety despite its complexity.
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