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Hi Arturo and welcome. This is a free float handguard, and the Delta Ring must be removed to install. Details starting around 2:30 in this Midwest installation video: https://midwestindustriesinc.com/two-piece-ar15-free-float-m-lok-handguard/ ------------------------- Cheers and stay safe

Hi Arturo, this model MI-21XM is the mid length rail for A2 front post. It is not a drop in model, it is free floating and the delta ring must be removed. See installation instructions here >>> https://midwestindustriesinc.com/content/installation-instructions/AR15-Two-Piece-Free-Float-Handguard-Instructions.pdf Stay safe & have a great day!