M4 Flashcards by Vanessa griffin

What caliber is the M4?

5.56 mm NATO

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What rounds are a standard duty issue for the M4?

M855 ball & M856 tracer

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Can M193 & 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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How much does an M4 weight with a load 30 round magazine?

7.5 pounds

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

Keep the muzzle from rising when firing

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What is the correct description of M4 carbine?

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

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The cycle of operation for the M4 is?

Feeding, clambering, locking, firing, unblocking, extracting, ejecting, cocking

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What is the maximum effective range with the M4 carbine on a “point target”?

500m

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What’s is the maximum effective range with the M4 carbine on an “area target”?

600M

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

45 rounds per min

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

90 rounds per min

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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?

700-970

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What is the sustained rate of fire for the M4?

12-15 rounds per min

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What are the steps to clearing the M4?

Safe, remove magazine, lock bolt to the rear, check chamber, safe, let bolt go forward

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What is the proper loading procedure for the M4?

Verify weapon is clear, safe, let the bolt go forward, close the ejection port, press the trigger, insert magazine, safe

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What is the proper reloading procedure?

Remove magazine, insert loaded magazine, release the bolt, tap forward assist

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

Apply immediate action procedure

What acronym identifies the proper immediate actions procedures for the M4?

S- slap magazine 
P- pull charging handle
O- observer chamber 
R- release charging handle 
T- tap forward assist 
S- shoot

How soon should immediate actions be applied?

Within 10 seconds

How many rounds fired continuously and rapidly through the M4 can cause a cook off?

140

After applying immediate action your M4 still fails to fire what action should be taken?

Remedial actions

What are the proper steps for applying remedial actions?

Clear weapon, remove jammed rounds, reload and attempt to refire

While applying immediate actions you observe a round in the chamber of your M4 carbine and you suspect the weapon is not hot enough to cook off, what action should you take?

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

If you can’t remove hot round from chamber of your M4 within 10 seconds what should you do?

Keep face away from ejection port, point weapon in safe direction, remove magazine, and let it cool down for 15 mins.

What is the definition of a cook off?

A round self detonates from heat buildup of the weapons chamber

If you here a POP or experience a noticeable change in felt recoil while firing the M4 what should you do?

Stop firing bullet may be stuck in barrel

What could happen if immediate action is applied and the M4 is fired with a bullet stuck in the barrel?

Weapon could explode resulting in damage to the weapon or injury of person

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

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

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

Failure to extract

What 3 types of lubricants are authorized for use of M4 carbine?

CLP, LSA, LAW

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

-10 F or above

For temperatures under -10F what lubricant should you use on your M4?

LAW

Can you use two types of lubricants simultaneously on the M4?

What is the definition of “lightly lubricant”

Barley visible to the eye

What is the definition of “generously lubricant”?

Enough to spend with a finger

What must you do before switching lubricants on the M4?

Completely remove old lubricant

Under attic conditions what action should be taken to prevent the M4 from freezing up?

Clear weapon and hand cycle the weapon every 30 mins

Under hot or wet conditions how should the M4 be lubricated?

Clean and lubricant more frequently with CLP and LSA

What must weapons and magazines be frequently inspected for in hot and wet climate?

Corrosion

In hot and dry climate how should the M4 be lubricated?

Lightly lubricate internal parts only using CLP and LSA

I’m hot and dry climate must be continually cleaned from the weapon to prevent stoppages?

Sand and fine dust.

In hot and dry climate how often should you clean your M4?

Daily or as soon as possible after firing weapon

In hot and dry climate what can you do to help keep dust and sand out of your M4?

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