The purpose of this manual is to provide the instructions and manufacturing data for the conversion of the Ruger 20–22, semi–automatic carbine, into a selective fire automatic unit.

When modified to the specifications given, the weapon retains its semi–automatic mode of operation and also allows fully automatic functioning by moving the selector lever into the proper position.

The Ruger 10–22 made its debut in 1964, and has become one of the world's most popular firearms of its type in the world.

This weapon is the logical choice for automatic conversion because they have proven themselves to be well made, very rugged, maintain a relatively light weight, and are adaptable to many different sighting arrangements.