Browning 1911-22 A1 Red Dot Options?

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I have a Browning 1911-22 and the factory sights are terrible (see attached image). I would love to put a red dot on it.

Since the slide is so narrow, like 0.75", I believe I would need some sort of mount. Are there any suggestions?

I am also assuming my slide needs to be milled to accommodate a mount.

Additionally, what is the narrowest red dot out there for a pistol? It's just for range use, so it doesn't have to be super rugged or tactical.