This guide details the field caliber conversion process for the Barrett M22 (Mk 22) modular sniper rifle, as demonstrated by Ryan Cleckner. It covers the steps for switching between calibers like .300 Norma Magnum and 7.62x51mm NATO, emphasizing the need for a re-zero after the change. The M22's modularity is highlighted as a key feature for adapting to various mission requirements.
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