This guide details the tool-less quick-change barrel system of the Zastava M19 MCS, as demonstrated by lead engineer Dragan. The system allows for rapid barrel swaps between calibers (7.62x39mm and 6.5 Grendel) and lengths (16-inch to 10-inch) without tools, even when the firearm is hot. This modularity is a key feature of the M19 MCS, designed for modern combat scenarios.
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