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No, that is for .338 or 8.6mm calibers and is not threaded correctly to fit on most 5.56mm barrels. The 5.56 version is not in stock but would be this one: https://www.budsgunshop.com/product_info.php/products_id/1650/surefire+sfmb556+suppressor+adapter+muzzle+brake+m16+m4+5.56mm+stainless+steel