If Turok wore a necktie and hated Mondays, this would be his weapon of choice. You can build and brandish your own by buying and reading Lego for Adults. Read more, and check out the video. Lord knows what else is in that book. If the MPAA movie guidelines are any indication, one could reassonably expect Lego creations centering on "adult themes, adult activity, hard language, intense or persistent violence, sexually-oriented nudity, drug abuse or other elements..."
Awesome. Lego nudity (SFW!) happens to be quite a blocky, multi-colored turn-on for me. Wait. What? Oh, here's a video of the Lego gun.