MK3 Firearms offers a custom package for Ruger Mark IV Standard pistols, dubbed the 'MK O' or 'Ruger Mark Offensive'. This modification includes threading the barrel to 1/2x28 for suppressor compatibility, installing fiber optic sights, and performing internal work with Volquartsen components. The trigger job is highlighted, demonstrating a short take-up, crisp brake, and audible reset. The package can be applied to new pistols or by retrofitting customer-sent Mark I, II, III, or IV models.
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