Philip, no this one will not fit. The Equalizer uses the Holosun 507K footprint, here is one that will fit
budsgunshop.com/product_info.php/products_id/137909/holosun+he507k-gr-x2+reflex+sight+multi+reticle />Stay safe & have a great day!

As mentioned below, The optic footprint on the Equalizer is for the Holosun 507k. If you're dead set on the Sig optic then you'd have to go with the Sig Romeo zero, not the Sig Romeo Pro 1.
Here's a link to the 507k that will fit.
budsgunshop.com/product_info.php/products_id/137909/holosun+he507k-gr-x2+reflex+sight+multi+reticle />

Phillip, no, the S&W equalizer uses a holosun 507K/RMSc footprint. So you would want the sig Romeo zero, not the Romeo 1 pro. The Romeo 1 pro you linked to won't fit. Unfortunately buds doesn't have any Romeo zeros in stock. If interested just Google the upc (798681618958) and you can find one. Sorry but hope this helps.

Hi Philip and welcome to the Buds Community. No Sir. The Romeo 1 Pro uses the Leupold Deltapont Pro footprint. The Holosun has the required footprint for direct fitment : budsgunshop.com/product_info.php/products_id/137909/holosun+he507k-gr-x2+reflex+sight+multi+reticle - Cheers and stay safe!