MIL-DTL-63997 Rifle, 5.56 Millimeter: M16A2This detail specification prescribes the requirements and identifies the verification procedures for the lightweight, air-cooled, gas operated, magazine-fed, 5.56 millimeter \(mm\) weapon designed for either three shot automatic burst or semi-automatic fire, hereafter referred to simply as the weapon.

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MIL-DTL-63997C

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 900 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.