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Hi John and welcome. This will be a direct slide fit. The Hellcat OSP slides are machined to fit the Springfield Micro footprint which is 100% compatible with the existing Shield RMSc optic footprint which is the 507K Footprint. Cheers and stay safe!

Hi John, this is not a direct fit, youb will need an adapter plate >>> https://freedomgorilla.com/blogs/news/best-hellcat-optics-adapter-plates-how-to Stay safe & have a great day!