I have the option to purchase an older MPA BA Comp stock that does not have the full length Arca cut at an attractive price. I really would like the full length arca cut and it is my understanding that the latest version of the MPA BA Comp has this standard. Has anyone ever had a smith do full length Arca cuts on an older MPA Chassis? Can this be done? Is this an average difficult level machining (milling) task or something more involved?