M4 Rifle Flashcards
What FM covers the M4 Rifle?
FM 3-22.9
What are some characteristics that describe the M4 Rifle?
- 5.56 mm
- Magazine fed
- Gas-operated
- Air-cooled
- Shoulder-fired weapon
- Semiautomatic or three-round burst
- Hand-held
The M4-series carbine consists of three (3) weapons—what are they?
(1) M4
(2) M4A1
(3) M4 modular weapon system (MWS)
Which of the M4-series carbine, the M4, the M4A1, or the M4 modular weapon system (MWS), is fully automatic?
M4A1
Which of the M4-series carbine weapons, M4, M4A1, or M4 modular weapon system (MWS), can the firer move the selector lever (SAFE, SEMI, and BURST)?
The M4 & M4 modular weapon system (MWS)
What are the weights of the M4 Rifle?
(a) Without Magazine & Sling - 6.49 pounds
(b) With Sling & a loaded 20 round magazine - 7.19 pounds
(c) With Sling and a loaded 30 round magazine - 7.50 pounds
What are the 7 types of ammunition that can be used with the M4 Rifle?
(1) M193 – Ball
(2) M196 – Trace
(3) M199 – Dummy
(4) M200 – Blank (Violet tip and 7 petal rose crimp)
(5) M855 – Ball (Green Tip)
(6) M856 – Tracer (Red Tip)
(7) M862 – Short Range Training Ammunition (Plastic with a Blue Tip)
What are the max effective rates of fire for the M4 Rifle?
(a) Semiautomatic - 45 rpm
(b) 3-Round Burst - 90 rpm
(c) Automatic - 150 to 200 rpm
(d) Sustained - 12 to 15 rpm
What is the M4 Rifle muzzle velocity?
2,970 feet per second
What are the three (3) ranges for the M4 Rifle?
(1) Maximum Range - 3,600 meters
(2) Max Effective Range for a Point Target - 500 meters
(3) Max Effective Range for an Area Target - 600 meters
What is the definition of Maximum Effective Range?
The greatest distance at which a Soldier may be expected to deliver a target hit
What is the Barrel rifling for the M4 Rifle?
Right-hand twist 1/7
What is the basic load of ammunition for the M4?
210 Rounds total (7 magazines with 30 rounds in each)
How much does the elevation knob adjust the point of aim for the M4 Rifle?
300 to 600 meters
What is the overall length of the M4 Rifle?
(a) Buttstock Closed - 29.75 inches
(b) Buttstock Open - 33.00 inches
What are the four (4) positions for the M4-series carbine rifle buttstock?
(1) Closed
(2) 1/2 Open
(3) 3/4 Open
(4) Full Open
What are the proper procedures for applying Immediate action with M4?
(1) Slap gently upward on the magazine to ensure it is fully seated, and magazine follower is not jammed
(2) Pull charging handle to rear fully
(3) Observe for the ejection of a live round or expended cartridge (if the weapon fails to eject a cartridge, perform remedial action)
(4) Release the charging handle (do not ride it forward)
(5) Tap the forward assist assembly to ensure bolt closure
(6) Squeezes the trigger and try to fire the rifle
Remember: SPORTS
What are the proper procedures for applying Remedial action with the M4?
(1) Try to place the weapon on safe
(2) Remove the magazine
(3) Lock the bolt to the rear
(4) Place the weapon on safe if not already done
What are the two (2) basic elements of the Sight picture?
(1) Sight Alignment
(2) Placing of the Aiming Point
What are the three (3) steps required in order to mechanically zero the M4?
(1) Adjust the front sight post up or down until the base of the front sight post is flush with the front sight post housing
(2) Adjust the elevation knob counterclockwise until the rear sight assembly rests flush with the detachable carrying handle and the 6/3 marking is aligned with the index line on the left side of the carrying handle
(3) Position the apertures so the unmarked aperture is up and the 0-200 meter aperture is down. Rotate the windage knob to align the index mark on the 0-200 meter aperture with the long center index line on the rear sight assembly
In which three (3) situations is mechanically zeroing the weapon only necessary?
- When the weapon zero is questionable
- The weapon is newly assigned to the unit
- The weapon sights have been serviced
What part of the M4 Rail Adapter System may be removed to perform PMCS?
Only the Lower Assembly
What are the three (3) steps required in order to battle sight zero the M4?
(1) Adjust the elevation knob counterclockwise until the rear sight assembly rests flush with the detachable carrying handle and the 6/3 marking is aligned with the index line on the left side of the detachable carrying handle. The elevation knob remains flush
(2) Position the apertures so the unmarked aperture is up and the 0-200 meter aperture is down
(3) Rotate the windage knob to align the index mark on the 0-200 meter aperture with the long center index line on the rear sight assembly
What are the procedures for clearing the M4 Rifle?
(1) Point the muzzle in a designated SAFE DIRECTION
(2) Place selector lever on SAFE (if weapon is not cocked, lever cannot be placed on SAFE)
(3) Remove magazine by depressing the magazine catch button and pulling the magazine down
(4) Lock bolt open, pull charging handle rearward. Press bottom of bolt catch and allow bolt to move forward until it engages bolt catch. Return charging handle to full forward position
(5) Visually (not physically) inspect the receiver and chamber to ensure these areas contain no ammo
(6) With the selector lever pointing toward SAFE, allow the bolt to go forward by pressing the upper portion of the bolt catch
(7) Place the selector lever on SEMI and squeeze the trigger
(8) Pull the charging handle fully rearward and release it, allowing the bolt to return to full forward position
(9) Place the selector lever on SAFE
(10) Close the ejection port cover
How do you perform a Functions check (safe, semi, burst) on the M4?
(1) Place selector lever on Safe. If selector switch will not go on safe, pull charging handle to rear & release. Place selector lever on safe. Pull the trigger to the rear, the hammer should not fall
(2) Place selector lever on Semi. Pull trigger to rear & hold. Hammer should fall. While holding trigger to the rear, pull charging handle to rear & release. Release trigger & pull it to rear again. Hammer should fall
(3) Place selector lever on Burst. Pull charging handle to rear & release. Pull trigger to rear & hold. Hammer should fall. While holding trigger to rear, pull charging handle to rear 3 times & release. Release trigger & pull it to rear again. The hammer should fall
