All Staccato DUO default to the DPP foot print. RMRs require an adaptor plate. I don't think the USMS SOG contract was a deciding factor in that. It is logical as the DPP optic window sits higher, making the tall optic your default and adding the thickness of an adaptor plate to the shorter optic allows the same BUIS to be visible through the window of both optics.
SIG's current PRO optics cut accommodates both the DPP / SIG R1 PRO and the RMR, which was a requirement for the CBP contract.
Holosun has something new which seems to be a direct response to this RFI.
https://www.instagram.com/p/CYvalseL...dium=copy_link
https://pistol-forum.com/showthread....ts-MOS-cut-out