Threaded Barrel Shroud for 1/2-28 TPI - 6 Inches [TBS-152] - $52.00 : Tacticool22, Tactical .22 Rifle Parts and Accessories

thats the one you want if you have the threaded barrel version of the 15-22.

or the shorter version

http://www.tacticool22.com/shop/inde...products_id=10

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M&P 15-22 Fanboy