The application of the plasma-injection technique (involving dc-discharge preionization) to a CW CO2 laser operating with recirculated gas is described. Measured characteristics of the discharges, the gain, and the output power are presented. An output of 110 W was obtained with a specific efficiency of 1.0 J/1 of flowed gas at a pressure of 10 kPa. A simplified model is developed to calculate a characteristic length of the main discharge which is useful for design purposes. This type of laser may be scaled simply to higher output powers, requires a gas mixture with only 20 percent He, is compact and robust, and yet is simple in its electrical and mechanical requirements.