I saw a picture of the Nerf Maverick while poking around on someone else's friends page (I think it was redneckgaijin's), and snagged one on sale today at Target for seven bucks. It rocks. The grip is sized for adult hands, and it's basically a short-barrelled .40 Nerf revolver with an impressively big cylinder that can be popped out for loading (and snapped back in by flicking your wrist). Only one shot per pull-back of the spring, but it fires pretty forcefully. About a 9-10 inch drop when fired from about 16 feet. Each pull of the trigger rotates the six-shot cylinder and (if primed) fires. It has the mandatory orange barrel tip, but is otherwise mostly dark blue and golden yellow, not too tacky as Nerf goes. It has a nice heft, weighing about a pound (0.44 kg), and the total length is 11" (28cm). There's a little clip for attaching it to another new Nerf gun, but it looks stupid if you do so.
Addendum: the rear half actually looks more like an automatic pistol, a la the Browning 1911. The cylinder is where the barrel normally would be.