Hi William, I think you actually have a couple of options here.
EGW makes this mount, if you have the Walther slide -- https://www.egwguns.com/vortex-viper-venom-colt-1911-22-rail-gun-walther-slide-22-sight-mount-fits-burris-fastfire-and-docter
And MSP has this model -- https://www.mountsplus.com/1911-red-dot-mounts.html
I swear, I didn't instigate this one. I was just minding my own business, plinking on the silhouette range with my HK416, enjoying the day. Another shooter comes strolling over to talk to my buddy that I'm shooting with, they're yacking it up, and all of a sudden this guy says, "Know anyone looking for an SR-22?" :confused: Ok, damn it, first thing I do is wheel around, pluck my ear plug out and say "How much?" Damned if it wasn't all it took right there. I whipped out my S3 and paid him electronically on the spot and 10 minutes later I'm shooting my SR-22. :grin: