A rimfire .22 autoloading rifle or carbine first introduced by Sturm, Ruger & Co. in 1964. In stock form it's fed by a flush-mounting 10 round rotary magazine, hence the "10" part of the name. It's easily the most popular auto. .22 rifle ever manufactured.
The Ruger 10/22 is likely the most widely customizable rifle of any configuration/caliber on the market today.
A bolt action rifle, available in many calibers, it is said to be the most accurate "out of the box" of any manufacturer. It is used primarily as a hunting firearm. The US Military also uses it as the basis for their M24 Sniper's Weapon System (SWS) in 7.62x51mm NATO caliber.
I know I would've bagged that deer had I been using a Remington Model 700 instead of this sub-par Winchester.