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Hi Jerr, It installs using a barrel nut. Mid-length and rifle length drop in hand guards are designed to work with triangle hand guard caps. Make sure your mid-length/rifle length upper has a triangle hand guard cap to allow the hand guard to be installed. A carbine uses a round hand guard cap. Tech Questions - https://www.midwestindustriesinc.com/help_answer.asp?ID=21#252