Looks like there's more than enough meat left to dovetail the front if you wanted to. The sight would probably even cover the impression left by the last installation so that you would never even know. Not something you want to attempt at home with the dremel unless you've done it a few dozen times before. 
As jimb says though it looks like s&w, and those are readily available.
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As jimb says though it looks like s&w, and those are readily available.
