A conversion kit and method for converting the RUGER.RTM. 10/22.RTM. semi-automatic caliber rim fire rifle to shoot 0.17 HM 2 cartridges utilizes the original bolt in the receiver and replaces the bolt operating handle with increased weight to replace the original bolt handle along with a 0.17 caliber barrel to permit the modified rifle to safely fire, eject and reload the 0.17 caliber cartridges.

 
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