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Old February 22, 2013, 11:22 PM   #8
Senior Member
Join Date: November 6, 2011
Location: NE Georgia
Posts: 1,070
You can buy a barrel and upper from Tactical Solutions that will fit your lower grip frame.
As someone said, the RST is a Ruger Standard, the Mk I was a target model in either 5 1/4" heavy tapered target barrel, 5 1/2" bull barrel or 6 7/8" heavy tapered target barrel. the MK Is had adjustable sights where the standards had fixed sights.
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