MIL-DTL-70599C
assembly shall be free of cracks, seams, or other defects after high pressure resistance test.
3.6.3.4 Bolt assembly integrity. After the high pressure resistance test, the bolt assembly
shall be free of cracks, seams, or other defects after high pressure resistance test.
3.6.3.5 High pressure test cartridge integrity. After the high pressure resistance test, the
cartridge cases shall be examined for bulges, splits, rings and other defects caused by defective
chambers of the barrel assembly.
3.6.4 Function firing.
3.6.4.1 Function firing semi-automatic. The weapon shall operate without malfunctions
or unserviceable parts (see 6.10.3), as defined by Table I, during one 30-round cycle in semi-
automatic mode. Rounds number 5 thru 15 shall be used for the target and accuracy verification
in support of 3.6.6.
3.6.4.2 Function firing burst. The weapon shall operate without malfunctions or
unserviceable parts, as defined by Table I, during one 30-round cycle in burst mode. The first
trigger pull shall fire one, two or three rounds. Each successive trigger pull shall fire three (3)
rounds as long as the trigger is held fully rearward during the entire three (3) round burst. The
last trigger pull when the magazine is emptied shall be a one, two or three round burst. The
fourth or fifth trigger pull shall be used for the cyclic rate of fire verification in support of cyclic
rate of fire (see 3.6.5).
3.6.5 Cyclic rate of fire. The cyclic rate of fire for three (3) round burst firing using a 30
round magazine shall be within 700 to 970 rounds per minute when firing M855, 5.56mm ball
cartridges, in accordance with drawing 9342868. The cyclic rate of fire measurement shall be
taken on a three round burst, occurring on the fourth or fifth trigger pull of the function firing
burst (3.6.4.2) verification.
3.6.6 Targeting and accuracy. Ten (10) rounds shall be fired from each weapon at a
target, the heavy outline specified in Figure 1, located at 100 yards. The extreme spread shall be
in accordance with Figure 1. The M855, 5.56mm ball cartridges shall be in accordance with
drawing 9342868 and shall have an average vertical and horizontal standard deviation between
3.4 inches and 4.0 inches at 600 yards. For each weapon, the target and accuracy measurement
shall be taken using rounds number 5 thru 15 of the function firing semi-automatic (see 3.6.4.1)
verification.
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