Technical data

TM 9-1005-319-23&P 0009
0009-5
(5) Tighten index screw and remove wrench.
(6) Check for proper setting.
ALL WEAPONS
7. Make a functional check on an assembled weapon with selector lever in SAFE, SEMI, and
BURST/AUTO positions. Any portion of this check may be used alone to determine the operational
condition of any specific firing position selected.
a. Remove magazine if installed. Pull charging handle assembly to rear. Check that chamber is
clear. Let bolt and bolt carrier assembly close. Do not pull trigger. Leave hammer in cocked
position.
WARNING
If weapon fails any function tests, perform required maintenance.
Continued use of the weapon could result in injury to, or death of,
personnel.
b. Place selector lever in SAFE position and pull trigger. Hammer should not fall.
c. Place selector lever in SEMI position. Pull trigger. Hammer should fall.
NOTE
For the purpose of the following check "SLOW" is defined as 1/4 to 1/2 the normal
rate of trigger release.
d. Hold trigger to the rear, charge weapon, and release the trigger with a slow, smooth motion,
without hesitations or stops, until the trigger is fully forward; an audible click should be heard.
Hammer should not fall.
e. Repeat the SEMI position test five times. The weapon must not malfunction during any of these
five tests. If the weapon malfunctions during any of these five tests, repair (see WP 0021).
M16A2, M16A4, and M4 ONLY
f. Place selector lever in BURST position. Charge weapon and pull trigger. Hammer should fall.
g. While holding trigger to the rear, pull charging handle assembly to rear and release three times.
Release trigger. Hammer should not fall. The burst disconnector should have held the hammer to
the rear while the trigger was in the pulled position. See item 14 for detailed explanation and
function check of three-round burst.
h. Pull trigger. Hammer should fall. This should be the first round of a three-round burst.