https://midstatefirearms.com/product/ar-308-lpk-conversion-kit-convert-from-ar15-lower-parts-kit/

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Trouble finding a 308 lower parts AR conversion kit? Already have an Ar15 lower parts kit?  Did you know that both the Ar15 and ar10 use many of the same parts? The difference is the bolt catch and the takedown pins. Buy this AR 308 lower parts kit and convert your Ar15 lower parts kit to be used with your ar 308. 
308 LPK Includes:

  • 308 Bolt Catch
  • 308 Bolt Catch set screw
  • 308 takedown pin & pivot pin
  • hammer spring

    Takedown pins are ~.275″ diameter.