M4 Flashcards by Jessie Trusty

Loaded with a 30 round magazine, the M4 carbine weighs

7.5 lbs

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What rounds are standard duty issue for the M4 carbine?

M855 ball / M856 tracer

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What caliber is the M4 Carbine?

5.56mm NATO

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Can M193 ball and M196 tracer be safely fired in the M4 carbine?

Yes

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How can M855 ball ammunition be identified?

Copper jacketed projectile with green tip

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How many rounds can be loaded into the standard issue M4 carbine magazine?

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Loaded with a 30 round magazine, the M4 carbine weighs?

7.5 lbs

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What is the purpose of the compensator on the M4 carbine?

Helps keep the muzzle from rising during firing.

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What is the correct description of the M4 carbine?

Light weight, gas operated, air cooled, magazine fed, shoulder fired weapon

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The cycle of operation for the M4 carbine is?

Feeding, chambering, locking, firing, unlocking, extracting, ejecting, cocking

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What is the maximum effective range with the M4 carbine on a “Point Target”?

500 m

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What is the maximum effective range with the M4 carbine on an “Area Target”?

600 m

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What is the maximum effective rate of fire on “SEMI” for the M4 carbine?

45 rounds per minute

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What is the maximum effective rate of fire on “BURST” for the M4 carbine?

90 rounds per minute

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The M4 carbine has a maximum range of?

3600 m

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What is the cyclic rate of fire for the M4 carbine?

700 – 970 rounds per minute

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What is the sustained rate of fire for the M4 carbine?

12 – 15 rounds per minute

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What are the proper steps to “Clearing” the M4 carbine?

Place selector lever on “SAFE” if possible,

remove magazine, lock bolt to rear, check chamber, ensure selector on “SAFE”, let the bolt go forward.

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What is the proper loading procedure for the M4 carbine for duty?

Verify weapon clear, selector to “SAFE”, close bolt; close ejection port cover, press trigger (hammer should not fall) insert magazine (if authorized), ensure selector on “SAFE”.

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What is the proper procedure for reloading the M4 carbine?

Remove empty magazine, insert loaded magazine, and hit bolt catch to close the bolt, tap forward assist.

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If you pull the trigger and your M4 carbine fails to fire, what must you do?

Quickly apply Immediate Action procedures.

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What are “Immediate Action” procedures for the M4 carbine?

Slap, rack, pull

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How soon should “Immediate Action” be applied to avoid possible cook-off of a round?

Within 10 seconds

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If after applying “Immediate Action” to your M4 carbine, it still fails to fire, what action should be taken?

Apply “Remedial Action” procedures.

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What are the proper steps for applying “Remedial Action” to the M4 carbine with a “failure to feed”?

Clear weapon, remove jammed rounds, reload and attempt to fire.

While applying Immediate Action you observe a round in the chamber of your M4 carbine and you suspect the weapon is hot enough to cause a cook-off, what action should you take?

Keep your face away from the ejection port and remove the round fast. If you can’t remove the round within 10 seconds, remove the magazine and let the weapon cool for 15 minutes.

If you cannot remove a round from the “hot” chamber of your M4 carbine within 10 seconds, what action should you take?

Keep your face away from the ejection port, point weapon in a safe direction, remove the magazine and let weapon cool for 15 minutes.

What is the definition of a “Cook-off”?

When a round self detonates from heat | buildup in a weapon’s chamber.

If you hear a “POP” or experience a noticeable change in felt recoil while firing the M4 carbine, what should you do?

DO NOT apply “Immediate Action”, stop firing immediately because a bullet could be stuck in the barrel.

What could happen if Immediate Action is applied and the M4 carbine is fired with a bullet stuck in the barrel?

The weapon could explode resulting in damage to the weapon and injury or death to the shooter or others.

What could happen if Immediate Action is applied and the M4 carbine is fired with a bullet stuck in the barrel?

The weapon could explode resulting in damage to the weapon and injury or death to the shooter or others.

What should you do if you believe a bullet may be stuck in the barrel of your M4 carbine?

Clear the weapon, open the receivers, remove the bolt carrier group and inspect the barrel for obstruction.

What should you do if you believe a bullet may be stuck in the barrel of your M4 carbine?

Clear the weapon, open the receivers, remove the bolt carrier group and inspect the barrel for obstruction.

What should you do if you believe a bullet may be stuck in the barrel of your M4 carbine?

Clear the weapon, open the receivers, remove the bolt carrier group and inspect the barrel for obstruction.

What type malfunction is considered “extremely serious” because of the hazard to the shooter?

Failure to extract

What 3 types of lubricant are authorized for use on the M4 carbine?

CLP, LSA, LAW

What temperature ranges require you to use CLP or LSA on your M4 carbine?

-10 F and above

For operation under arctic conditions below -10 F, what lubricant must be used on the M4 carbine?

LAW

Can two different types of lubricant be used simultaneously on the M4 carbine?

What is the definition of “Lightly Lubricated”?

Barely visible to the eye

What is the definition of “Generously Lubricated”?

Enough to be spread with a finger

What must you do before switching lubricants on the M4 carbine?

Completely remove the old lubricant.

Under arctic conditions, what action should be taken to prevent the M4 carbine from freezing up and becoming in-operable

Clear the weapon and hand cycle the weapon | every 30 minutes.

Under arctic conditions, what action should be taken to prevent the M4 carbine from freezing up and becoming in-operable.

Clear the weapon and hand cycle the weapon | every 30 minutes.

Under hot, wet (jungle) conditions, how should the M4 carbine be lubricated?

Clean and lubricate more frequently with LSA or CLP.

What must the weapon and magazines be frequently inspected for in a hot, wet (jungle) climate?

Corrosion

In a hot, dry (desert) climate, how should the M4 carbine be lubricated?

Lightly lubricate internal parts only using | CLP or LSA.

In a hot, dry (desert) climate, what must be continually cleaned from the weapon to prevent stoppages?

Sand, fine dust

In a hot, dry (desert) climate, how often should you clean your M4 carbine?

Daily or as soon as possible after firing

In a hot, dry (desert) climate, what can you do to help keep dust and sand out of your M4 carbine?

Use muzzle cap, keep ejection port closed, keep magazine installed and use protective bag. Also clean weapon and magazines frequently

As a minimum, what items must be contained in the M4 weapon cleaning kit?

Cleaning rod sections, cleaning rod handle, eyelet, small arms cleaning brush (tooth brush), bore brush, chamber brush, patches, cloth, pipe cleaners, lubricant and/or CLP.

As a minimum, what items must be contained in the M4 weapon cleaning kit?

Cleaning rod sections, cleaning rod handle, eyelet, small arms cleaning brush (tooth brush), bore brush, chamber brush, patches, cloth, pipe cleaners, lubricant and/or CLP

What lubricant is also used to clean the M4 carbine?

CLP

What item from your cleaning kit should be used to clean the firing pin hole in the bolt of the M4 carbine?

Pipe cleaner

What item can be used to clean carbon from the back of the M4 carbine bolt assembly?

Old worn bore brush and CLP

How is the chamber brush used to clean the M4 carbine chamber?

Attach to cleaning rod handle, execute plunging and turning strokes.

How is the chamber brush used to clean the M4 carbine chamber?

Attach to cleaning rod handle, execute plunging and turning strokes.

When operating under normal conditions, how should the M4 carbine bolt assembly and cam pin area be lubricated?

Generously with CLP or LSA

When operating under normal conditions, how should the outside of the M4 carbine barrel assembly be lubricated?

Lightly with CLP or LSA

When operating under normal conditions, how should the M4 carbine front sight post be lubricated?

One drop of CLP or LSA onto the front sight post detent pin.

When operating under normal conditions, how should the Gas Carrier Key be lubricated on the M4 carbine?

Place one drop of lubricant into bolt carrier key.

During cleaning and inspection of the M4 carbine, what items should you check on the barrel assembly?

Compensator looseness, Front sight post not bent, Gas tube not bent or cracked

When carrying the M4, which safety rule(s) apply?

Treat all weapons as if loaded. Never point the weapon at anything or anyone you are not willing to shoot. Positively identify your target; know what is around and behind your target. Keep your finger OFF the trigger until your sights are on target

Which statement is true about the characteristics of the M68 Close Combat Optic

Does not require the red aiming dot to be aligned in the center of the scope.