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  1. Gunsmithing
    I have an MX8 Top Single and have been told I have a 4mm rib. What does 4mm refer to? and ... I'm looking at purchasing an OU set so assume I need a 4mm ramp or step rib barrel to be compatible with my set up? If the seller doesn't know if it's a 4mm how can I / we find out? Any help on this...
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