re: help on an AR-15 build

quote:

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Hand guards can be changed out, correct?

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Yes.

But... lets say you get an upper with handguard designed to fit into the delta ring and handguard cap that is behind the front sight gas block. You can get drop in replacement handguards, like the Magpul MOE series that will fit right in and allow you to mount accessories to the handguard. If you want to change out to a free floated handguard instead of another "drop in" handguard it can take some special tools and a little more know how.