I've used the Hornet already, and to be completely honest, ITS CRAP. The scout is probably the closest nerf could get to a semi-auto. maybe a combonation of the Scout and the Powerclip could work, except the clip would be internal, as opposed to it just stickin out there...
Are you INSANE?!?!?! The Scout IX-3 completely and utterly SUCKS! My stock NiteFinder is better than my friend's modified Scout. My modded NiteFinder would eat a Scout for lunch, having more than DOUBLE a Scout's range! My Scout gets about 20 feet, my stock NF gets more than 35. You think the Hornet sucks? Ompa's Hornet shoots 80 feet average. Let's see, 20 feet single shot or 80 feet 6 shot/semi auto... hmm... I'm going with the Hornet.