The ornamental design for a clip-on magazine loader, as shown and described.
FIG. 1 is a perspective view of the clip-on magazine loader mounted to a magazine;
FIG. 2 is a perspective view of the clip-on magazine loader shown in FIG. 1;
FIG. 3 is a left hand facing side view of the clip-on magazine loader shown in FIG. 1;
FIG. 4 is a right hand facing side view of the clip-on magazine loader shown in FIG. 1;
FIG. 5 is a top view of the clip-on magazine loader shown in FIG. 1;
FIG. 6 is a bottom view of the clip-on magazine loader shown in FIG. 1;
FIG. 7 is a rear end view of the clip-on magazine loader shown in FIG. 1; and,
FIG. 8 is a front end view of the clip-on magazine loader shown in FIG. 1.
The magazine which the clip-on magazine loader is mounted to in FIG. 1 is illustrated with broken lines and is included for the purpose of illustrating the environment of the design only and forms no part of the claimed design. The broken lines in FIG. 6 are included for the purpose of illustrating a portion of the clip-on magazine loader that forms no part of the claimed design.