This is a posable, high-grade or better injection-plastic kit of an item from the Gundam universe.

For those who prefer the Zaku green to the red, here's the Mega Size MS-06 Zaku.  Similar to its predecessor, the Mega Size Char's Zaku (linked below), this Zaku comes with a Zaku machine gun, Heat Hawk, Zaku Bazooka, and water-slide decals.  It even includes markings designed by Katoki Hajime!