Brians Surplus

Recent content by jlk47

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    1. J

      SBR Caliber Conversion ?

      I'm currently completing the Form 1 for an AR-15 10.5" SBR in 5.56mm. The receiver is marked 5.56mm and the form will have "5.56mm" in Block 4c as well. My question: After receiving ATF approval and then the build, can I install a 22 lr conversion kit and/or use a seperate 9mm upper for use...
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