AUTOMATIC PISTOL, CAL..45, M1911 AND M1911A1 (3) Aiming disks.-(a) For each sighting bar and each pistol rest a small disk (3 inches in diameter) is made of white cardboard or of tin with white paper pasted on it and with a small bull’s-eye In the center. In the exact center of the bull’s-eye is a small hole just large enough to admit the point of a pencil For indoor or close-range work the bull’s-eye should not be larger than a 50-cent piece. (b) There should be one 5-inch aiming disk for each squad for shot-group exercise at 25 yards. The large disk should be of tin, painted black, with a handle 4 or 5 feet long and of the same color as the paper on which the shot groups are to be made. b. Sighting exercises.-(1) First exercise.—(a) The squad leader or instructor shows a sighting bar to his squad or group and points out the front and rear sights, the eyepiece, and the removable target. He explains the use of the sighting bar as follows: 2. The front and rear sights on the sighting bar represent enlarged pistol sights.