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Perform a Function Check
on an M4 or M4A1 Carbine
071-100-0005

Conditions: Given an M4 or M4A1 carbine that you must confirm is operable.

Standards: Perform a function check and ensure that the carbine operates properly with the selector switch in each position.

Performance Steps
  1.        Check to ensure carbine is clear and the selector lever is on SAFE.
  2.        Check M4 or M4A1 carbine with selector lever in the SAFE position.
  a.        Pull the charging handle to the rear and release it.
  b.        Place the selector lever in the SAFE position.
  c.        Squeeze the trigger (the hammer should not fall).
  d.        Stop the function check if the carbine fails to function properly. Turn in malfunctioning carbine to unit armorer.
  3.        Check M4 or M4A1 carbine with selector lever in the SEMI position.
  a.        Place the selector lever in the SEMI position.
  b.        Squeeze the trigger, holding it to the rear (the hammer should fall).
  c.        Continue to hold the trigger to the rear while pulling the charging handle to the rear and releasing the charging handle.
  d.        Release the trigger with a slow, smooth motion until the trigger is fully forward (the hammer should not fall).
  e.        Squeeze the trigger (the hammer should fall).
  f.        Stop the function check if the carbine fails to function properly. Turn in malfunctioning carbine to unit armorer.
  4.        Check M4A1 carbine with selector lever in the AUTO position.
  a.        Place the selector lever in the AUTO position.
  b.        Pull the charging handle to the rear and release it.
  c.        Squeeze the trigger; the hammer should fall.
  d.        Hold the trigger to the rear and cock the weapon.
  e.        Fully release the trigger; squeeze it to the rear again; and the hammer should not fall.
  f.        Stop the function check if the carbine fails to function properly. Turn in malfunctioning carbine to unit armorer.
  5.        Check M4 carbine with selector lever in the BURST position.
  a.        Place the selector lever in the BURST position.
  b.        Pull the charging handle to the rear and release it.
  c.        Squeeze the trigger and hold it to the rear; the hammer should fall.
  d.        Continue to hold the trigger to the rear: pull the charging handle to the rear and release it three times.
  e.        Release the trigger.

Evaluation Preparation: SETUP: Have Soldiers use their assigned carbines and magazines.

BRIEF SOLDIER: Tell the Soldier to perform a function check and to tell the evaluator if the carbine malfunctions.

                                                                                                                                                                          Performance Measures        GO        NO-GO

  1.        Checked an M4 or M4A1 carbine with the selector lever in the SAFE position; verified the hammer did not fall.        ——        ——
  2.        Checked an M4 or M4A1 carbine with the selector lever in the SEMI position; verified the hammer fell.                      ——        ——
NOTE: Perform either step 3 or 4, as appropriate.                
  3.        Checked an M4A1 carbine with the selector lever in the AUTO position; verified the hammer did not fall.                   ——        ——
  4.        Checked an M4 carbine with the selector lever in the BURST position; verified the hammer fell.                                   ——        ——
  5.        Stopped the function check any time the carbine did not function properly and notified the evaluator.                        ——        ——

Evaluation Guidance: Score the Soldier GO if all performance measures are passed. Score the Soldier NO-GO if any performance measure
is failed. If the Soldier scores NO-GO, show the Soldier what was done wrong and how to do it correctly.

References
Required        Related
  TM 9-1005-319-10
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