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Hi Lyman, no this is not compatible with the original ROMEO1 cut pistols. You want this one https://www.budsgunshop.com/product_info.php/products_id/113463/sig+sauer+electro-optics+romeo1pro+1x+30mm+obj+6+moa+red+dot+black+cr1632+lithium , Stay safe & have a great day!

Yes sir this will fit the P320 family of pistols with the pro cut. Please see product description for further details. Hope this helps.
https://www.budsgunshop.com/product_info.php/products_id/180157/sig+sauer+romeo-rs+pro+red+dot+6+moa+dot+black

The Sig 320/M17 uses the Romeo1 Pro cut. The Pro is not the same as the Pro1. Product description states "ROMEO-RS PRO is suited for the optic ready P320, P226 & P229 Family of pistols with the PRO cut slide (not compatible with the original ROMEO1 cut pistols)"

Hi Lyman and welcome. No Sir, the Pro and Pr1 cuts are slightly different. The directly compatible Optic is here: https://www.budsgunshop.com/product_info.php/products_id/113463/sig+sauer+electro-optics+romeo1pro+1x+30mm+obj+6+moa+red+dot+black+cr1632+lithium ----------------- Cheers, stay safe and enjoy!

ROMEO-RS PRO is suited for the optic ready P320, P226 & P229 Family of pistols with the PRO cut slide (not compatible with the original ROMEO1 cut pistols)