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Look at this brochure, its from the HK JS site go to page 11 with the Mark 23, it may just be me but it looks like the front sight has been installed backwards.
http://www.heckler-kochjs.de/media/Links/HK_JS_engl.pdf
http://www.heckler-kochjs.de/media/Links/HK_JS_engl.pdf