I hadn't found a pic of one that had stripes like that until I saw the link posted above. And while this one has more of a brown stripe rather than the red ones, it definitely has one claw larger than the other. Glad to hear the resounding pistol as the answer. I was a bit afraid it would turn out to be a mantis (though they have pretty distinguishing bug eyes). It was in a great place to syphon him out of the tank if need be so I figured I'd double check!
A goby buddy is on my list of fish friends for the tank. I'll have to pick a good one for the shrimp to pair up with!
Thanks gang!