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Hi Norris and welcome. It includes Suppressor Height Night Sights and Optics plates. The only advantage is if you have a non OSP model and wish to upgrade the slide or just to have multiple Optics configurations without having to remount each time you switch. Cheers and stay safe!

The main advantage/upgrade is the fact that you can turn your Non-Optic ready model into an Optic Ready Unit!!! No need to send your slide out and wait on an optic mill job, all ready to go!!

Hi Norris, These 4" 9mm kits and assemblies provide original XD owners OSP capabilities as well as the ability to convert certain XD models to a full-size 4" 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. All kits ship with (1) XD5072 plate >>> https://store.springfield-armory.com/xd-osp-optic-mounting-plate/ Stay safe & have as great day!