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It will fit assuming your rifle currently has a two-piece handguard that is held on by a delta ring.

Angela, If you have DiamondBack DB15USB with A2 front sight gas block, and a carbine-length gas system and a standard two-piece handguard this quad rail will fit and function well. I've used this quad rail on two of my sporting rifles with the same set up.

Angela, yes Ma'am. Your Diamondback "Carbine" Hand guard can be replaced with this drop in Quad Rail Hand Guard. I is relatively easy and you can preview the procedure here : https://www.youtube.com/watch?v=3Izpps4r7zM