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...

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