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Hi Christopher and welcome back. The Sig Sauer Romeo Zero Elite has the popular RMS (or Shield) footprint. Cheers and stay safe!

Almost. An RMSc footprint uses front and rear recoil lugs. The 507k uses a modified RMSc without the rear lugs. It is highly advised to use a K to RMSc adapter.

straight from sig "Carbon-Infused WeaponsGrade Ultralight Polymer Housing with the ROMEOZero/ Shield RMSc Footprint, " see link under features https://www.sigsauer.com/romeozero-elite-1x24-mm.html

Hi Christopher, this has the ROMEOZero/ Shield RMSc Footprint >>> https://www.sigsauer.com/romeozero-elite-1x24-mm.html Stay safe & have a great day!