Matt, yes that gun should come with an additional non-threaded barrel according to the description for that UPC on gallery of guns. Link for reference: galleryofguns.com/genie/Default.aspx?item=XDMT9459BHCOSP&zipcode=

Matt - The XD(M) OSP (Optical Sight Pistol) is based on Springfield's XD(M) full-size pistol and features a milled slide with three (3) adapter plates for direct attachment of a red dot optic with no need for custom modifications. The XD(M) OSP sports a 4.5" match grade, hammer forged barrel and forged steel slide with a black Melonite finish. Classic XD ergonomics features include the Mega-lock textured frame, ambidextrous magazine release, and grip safety. It includes three backstrap panels to easily reconfigure the grip to small, medium, or large circumference. This model features 3-dot suppressor height iron sights. It includes a non-threaded barrel and two 19-round magazines. So, you get the best of both worlds.

Matt, the "Threaded Barrel'" Models are here : budsgunshop.com/catalog/search.php?q=XDMT9459BHCO+XD%28M&type=