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Part of the size is the belt feeding system, but most of the girth and mass create a more durable, long-term reliable system. Semi auto and occasional burst fire don’t generally lead to round counts that are six digits deep, but sustained full auto racks up the miles pretty quickly. Think of the Ma Deuce, if they could make a belt fed .50 that was more like the size of a Barrett, they’d put that into production in a heartbeat.