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Extra info for 40 mm Antiaircraft Gun [Mk. 1, 2] [Ord. Pmphlt. 820, prelim]
Adjustments If the sights are not in line, make the following adjustments: a. Loosen the two lock nuts of the front sight until it can be moved horizontally to a point at which the vertical center line of the sight is in line with the rear sight and the black cross on the target. b. Tighten the nuts slightly and then turn the adjusting collar until the horizontal center line of the front sight is in line with the rear sight and the black cross on the target. c. Tighten the lock nuts securely. Upon completion of the sight check and adjustment, remove the bore sights, and replace the case deflector brackets.
FRONT SIGHT (299342-1) FERRULE (299349-4) . SIGHT GUARD WELDMENT (345493) Figure 30 Mark 3 sight shown in position on the gun mechanisms of a twin mount. 1. 40MM Sight, Mark 3 The 40MM Sight, Mark 3, Figure 30. is used with a pair of 40MM Machine Gun Mechanisms installed in a 40MM Mount, Mark 1 (Twin) . The sight arm weldment is bolted to pads on the front end of each of the slides. 2. 40MM Sight, Mark 4 The 40MM Sight, Mark 4, Figure 3 L is used with two pairs of 40MM Machine Gun Mechanisms installed in a 40MM Mount, Mark 2 (Quad).
The recoil spring is retained at its forward end by a spring keeper threaded onto the water jacket. The sleeve on the water jacket provides a bearing surface for the assembly within the cylindrical fore part of the slide. Page 52 0. P. 820 Chapter IV SIGHTS A. DESCRIPTION OF. SIGHTS The sights provide a simple means of giving the necessary lead to allow for target motion during the time of flight of the projectile, and also provide for quick changing of the lead, as the position of the target changes.