The Rex Zero differs in detail from the SIG P series. The Rex Zero features a handy frame-mounted decocker that serves to lower the hammer from the cocked position. The manual of arms is simple. The appearance is simply attractive, even cool. Two tone with dark black over FDE looks great. For me the FDE frame is a way shooters like myself can show camaraderie with those in the sandbox just as I leave the green light burning on the porch for our soldiers.