M4

Question 1

What is the rifling of the m4?

Answer 1

1/7 twist

Question 2

What is the muzzle velocity of the m4?

Answer 2

2,970 feet per minute (approximately)

Question 3

What is the chamber pressure for the m4?

Answer 3

52,000 psi

Question 4

What are the maximum effective rates of fire?

Answer 4

Sustained rate of fire: 12-15rpm
Semiautomatic: 45rpm
Burst: 90rpm
Cyclic: 700-970rpm

Question 5

What are the maximum effective ranges?

Answer 5

Individual/point targets: 500 meters
Area targets: 600 meters
Maximum range: 3600 meters

Question 6

What are the parts of the m4?

Answer 6

•lower receiver•upper receiver•buffer and buffer spring•charging handle•bolt carrier•carrier gas key•carrier gas key screws•bolt•firing pin•firing pin retaining pin•cam pin•gas rings•extractor spring• extractor pin• extractor•ejector pin•ejector spring• ejector.

Question 7

What ammunition is not authorized for use with the m4 carbine?

Answer 7

M865 tracer (white tip)

Question 8

How can m855 ball ammunition be identified?

Answer 8

Copper jacketed projectile with green tip

Question 9

How many rounds can be loaded into the standard issue m4 carbine magazine?

Answer 9

30 rounds

Question 10

What is the purpose of the compensator on the m4 carbine?

Answer 10

Helps keep the muzzle from rising during firing

Question 11

How would you describe your m4 carbine ?

Answer 11

Lightweight, air cooled, gas operated, magazine fed, shoulder fired weapon that fires in semiautomatic, automatic , or (3 round) burst

Question 12

If after applying “immediate actions” to your m4 carbine ad it still fails to fire, what action should be taken?

Answer 12

Apply “ remedial action” procedures

Question 13

If the the m4 carbine bolt carrier assembly is locked to the rear or in its forward position and the weapon is dropped or jarred with a loaded magazine in the weapon, what could happen?

Answer 13

It could chamber a round

Question 14

What is the cycle of operations for the m4 carbine?

Answer 14

Firing, unlocking, extracting, ejecting, cocking, feeding, chambering, locking

Question 15

What blank firing adapter is used for the m4 carbine?

Answer 15

M23 , yellow in color and marked “ m4 carbine only”

Question 16

What primary form is given to the armorer so he/she can issue your weapon?

Answer 16

AF form 629

Question 17

What must you do if you pull the trigger and your m4 carbine fails to fire?

Answer 17

Quickly apply immediate action procedures

Question 18

How soon should “immediate action” procedures be applied to the m4 carbine to avoid possible cook-off of a round?

Answer 18

Within 10 seconds

Question 19

How many rounds fired continuously and rapidly through the m4 carbine can cause the weapon to cook-off a round?

Answer 19

140 rounds

Question 20

What are the proper steps for applying “ remedial actions” to the m4 carbine with a “ failure to feed”?

Answer 20

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

Question 21

While applying “ immediate actions” procedures, 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 actions should you take?

Answer 21

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

Question 22

What caliber is the m4?

Answer 22

5.56mm