These barrels are new "Take off" barrels and included are the adjustable rear target sights. These barrels can be used on earlier Ruger "MK"models with careful modification but you will need to do adequate research and measuring. The conversion can be accomplished with the careful use of hand tools. For my own use I simply measured the old barrel, carefully used a dremel to rough the cut and used a file to finish it. We have taken care to remove these without damage but you should expect to see some light rub marks or scratches in the finish.
Determined at checkout.
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