Springfield Armory Xd Osp Slide Assembly W/Barrel Assembly / Crimson Trace Black. These 4in 9mm kits and assemblies provide original XD owners OSP capabilities as well as the ability to convert certain XD models to a full-size 4in 9mm configuration. The slide assemblies featuring included cover plate are cut to accept OSP optics mounting plates available for a wide range of popular optics. Specifications for Springfield Armory Xd Osp Slide Assembly: Manufacturer: Springfield Armory Gun Make: Springfield Armory Gun Frame Size: Full Size Optic Cut: RMR Cut Color: Black Finish: Melonite Caliber: 9mm Luger Magazine Included: No Package Contents: Springfield Armory Xd Osp Slide Assembly Springfield Armory XD4904: Xd Osp Slide Assembly W/Barrel Assembly / Crimson Trace Black