Jerry Miculek can pretty much convince anyone that a 625 with clips is the fastest firing/reloading pistol on the planet. I've seen him draw, fire 6, reload, fire 6 and re holster in less than 4.25 seconds.. the guy is a mad man.
Meanwhile, on the topic....
I would really like a semi-auto medium load (between .308 and .30-06) rifle, which wasn't much longer than 30 inches over all and wieghs around 7 pounds with optics. Detachable mags and Sling necessary.
I would entertain the idea of an electronic sight as opposed to tradional optics.. (holosite, etc..)
This, IMHO, would be the ultimate Scout/guide gun....
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-Essayons