Mark Serbu, a gun designer, details the process of converting his RN 50 rifle from .50 BMG to 6.5x55 Swedish. This modification involves a custom-machined adapter bushing that threads into the receiver, allowing for the installation of a Savage 10/110 series barrel. The conversion is presented as a practical solution for export challenges and a way to adapt the robust RN 50 platform to a less powerful, more common cartridge.
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