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