Haahha! Of course you can guess what I did immediately after reading this. Yep, I googled overall length of assault rifles. :)

Here's what I read from the "Range Often" website: "The typical 16"-barreled AR-15 measures 32.75" in length, from muzzle to buttstock."

I mean...its height is under 3 feet, but it does have a 16-inch barrel:)