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by Jerry, from OH, United States Asked on February 13, 2018
This will fit any DPMS or ArmaLite upper receiver depending on which barrel nut you choose. These are High Profile (.210" tang) handguards. For a DPMS patter upper receiver, you would need barrel nut APRH308910 on this page: https://www.opticsplanet.com/aero-precision-m5e1-handguard-barrel-nut.html
This is quoted from the Aero Precision website for this product. "Our handguards use either the DPMS/Aero or Armalite interface and do not work with a standard barrel nut. If you are using our M5E1 Enhanced Upper Receiver, no additional pieces are needed." Then it goes on to sell you the proper nut.