There are four different cuts available on production 1911s. They are the 'standard' GI cut, the Bomar style cut, the Novak, and the LPA. The Ruger has the standard Novak cut. Just be aware that Ruger mounts the rear sight a bit higher than other manufacturers so you will have to match the front and rear sights to each other.

There are counterfeit Novaks on the market to fit into the other styles but all true Novaks will have their cut.