Abstract: A powder actuated nail gun includes a body, a trigger unit, a nose assembly. The body includes a first tube and a second tube. A room is defined in the second tube. The nose assembly includes a nose, two balls, two pressing members, two resilient members, and a collar. The nose includes a base, a tubular portion and a passage. The base includes two recesses in which the two pressing members are received. The two balls are located in two elongate holes of the base. When the nose assembly is moved toward the grip, the balls are pressed between the pressing members and a strike rod in the nose so that the strike rod is co-moved with the nose assembly. The piston of the strike rod is moved to a ready-to-shoot position in the cylinder. The nail gun is able to shoot nails continuously.