The zeroing is checked only in the situation when in the course of fire an unusual or abnormal deviation of impacts, spread/dispersion occurs or in the cases when replacement of parts and/or components or repair has been carried out which as a consequence could impair rifle zeroing. For checking of zeroing and zeroing-in, only the Model 43 cartridges in cal. 7,62 mm are allowed to be used. All cartridges must be of the same production series. The automatic rifle zeroing is checked for a range of 100 m, at which the rear sight is set to the range „3". Firing is carried out either with the fixed bayonet or without bayonet at the white target at 1 metre (3,28 ft) in height and 0,5 metre (1,64 ft) in width. The point of aim is in the middle of the bottom edge (black rectangle) of the shooting-in target, which is to be approximately on a level of rifleman's eye. The normal position of the mean point of impact shall be marked on the vertical line passing through the aiming point. This mean point of impact, when the rear sight is set to „3" should be at the height 28 cm (11in.) above the aiming point and at the same time it is the checking point when determining the accuracy of the automatic rifle zeroing. Round the checking point, the checking circle of 10 cm (3,9in.) in diameter is circumscribed. Firing is carried out in prone position (lying) with a rest. When firing the hand holding the rifle must be placed against the rest. Then 4 cartridges individually, accurately and steadily aimed are shot at the middle of the bottom edge of the black rectangle while the rifleman in the course of shooting is not changing neither the position of his body nor of the hand.
The rifle is considered to be zeroed-in if all the four hits - in extreme case 3 of the hits (if one of the hits shows a great deviation from others; so called flyer) - may be covered with the circle of 18 cm (7,08 in.) diameter and if, simultaneously, the mean point of impact is not deviated more than 5 cm (1,96 in.) to any side from the checking point.
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