What Is It? game 216

Once again, it's time for our collaboration with the always amusing What Is It? Blog. Can you tell us what this thing is? Or make a wild guess?

Give us your guess in the comment section below. One guess per comment, please, though you can enter as many as you'd like. Post no URLs or weblinks, as doing so will forfeit your entry. Two winners: the first correct guess and the funniest (albeit ultimately wrong) guess will win T-shirt from the NeatoShop.

Please write your T-shirt selection alongside your guess. If you don't include a selection, you forfeit the prize, okay? May we suggest the Science T-Shirt, Funny T-Shirt and Artist-Designed T-Shirts?

For a picture of this from a slightly different angle, check out the What Is It? Blog.

Update: the pictured object is an M15 Grenade Launcher Sight. The first commenter in with the correct answer was Berhard, who wins a t-shirt for his efforts! The t-shirt for the funniest answer goes to villaridge, who said it was "one of the many scale models that Gene Rodenberry had made whilst he was fine tuning what the Enterprise space ship would look like." See additional pictures of the grenade launcher sight and the answers to the other mystery items of the week at the What Is It? blog!