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Jayland, yes this is a drop-in rail and will fit on your M&P 15 Sport II with no issues. Have a great day!

Jayland, yes Sir, this is a Carbine Length 2-Piece Keymod drop in Rail. --((Features and Specifications)): - Hard anodized aluminum construction - Constructed out of heavy-duty aircraft-grade aluminum 6061-T6 - Rail accepts most picatinny, nato and weaver sized mounts - Includes hex key and one 5 slot picatinny rail piece - Material - Aluminum - Rail type - Picatinny/weaver - Length (in/mm) - 6.625 / 168in/mm - Weight, oz - 5.9oz.

Jayland, it sure will. The m&p sport 2 uses the same size two piece drop in handguard. So this will fit and function just fine. Very simple to replace. Hope this helps.

Yes, this will work just fine...