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It is drilled and tap so with the right mount, you could get a red dot on it.

Hi Bruce, yes this pistol is drilled and tapped for a mount (Scope or Red Dot). : https://www.google.com/search?biw=1280&bih=620&tbm=isch&sa=1&q=ruger+mark+4+competition+red+dot&oq=ruger+mark+4+competition+red+dot&gs_l=psy-ab.3...38279.44412.0.45295.12.12.0.0.0.0.255.1486.4j6j2.12.0....0...1.1.64.psy-ab..0.2.359...0i13k1.3FS-aqwR_4c#imgrc=_