Long story short, I have a No1 Mk3 sporter project with a sewer piped barrel and have a friend with a unwanted P14 barrel, what would be easier. Putting a 7x57mm Mauser barrel on and cutting a groove for extractor and rim of 7x57mmR or putting the P14 barrel on the rifle. What will be a bigger pain, granted I have a P14 in original full lenght wood that I could always put that barrel on when shotout.