NMCB Specific 105 Weapons Fundamentals

Question 1

Describe the characteristics of the M136 (AT-4).

Answer 1

Weight: 14.8lbs, (Cartridge 4lbs)
Caliber: 84mm
Length: 40in
Muzzle Velocity: 950fps
Maximum Range: 2100m
Maximum Effective Range: 300m
Minimum Arming Range: 10m
Warhead: HEAT (High Explosive Anit-Tank)

Question 2

What are the different firing positions of the AT-4?

Answer 2

Standing, Kneeling, Sitting, Modified Sitting, Prone

Question 3

Describe the firing mechanism for the AT-4.

Answer 3

The red trigger button is located forward of the cocking lever just behind the forward safety.

Question 4

Describe the safeties for the AT-4.

Answer 4

Transport Safety Pin The transport safety pin blocks the movement of the firing pin and prevents it from striking the cartridge percussion cap (not shown). To disengage the transport safety pin, pull it out and release.
Cocking Lever The cocking lever is attached to the firing rod. When the cocking lever is in the SAFE position, there is no contact between the firing rod and the trigger. To cock the AT4, push the cocking lever forward and down with the thumb of your right hand.
Forward Safety The forward safety is located on the forward end of the firing mechanism. The forward safety is connected to a steel rod that prevents the firing rod from striking the firing pin.

Question 5

Describe the misfire procedure for the AT-4 during training.

Answer 5

When the launcher fails to fire, immediately shout, “Misfire.”
Maintain the original sight picture.
Release the forward safety.
Recock the cocking lever. Check the backblast area; aim, fully depress, and hold down the forward safety; and press the red trigger button.
If the launcher still fails to fire, repeat Steps 1 through 4.
If the launcher still fails to fire, release the forward safety and return the cocking lever to the SAFE, uncocked position.
Take the launcher off your shoulder; keep the muzzle pointed toward the target.
Reinsert the transport safety pin.
Wait 2 minutes, then carefully lay the faulty launcher on the ground, muzzle facing toward the target.
Dispose of the faulty launcher according to SOP (Range Safety Officer).

Question 6

Describe the misfire procedure for the AT-4 during combat.

Answer 6

Release the forward safety. Immediately recock the cocking lever. Check the backblast area; aim, fully depress, and hold down the forward safety; and press the red trigger button.
If the launcher still does not fire, maintain your firing position, and return the cocking lever to the SAFE position. Remove the launcher from your shoulder and reinsert the transport safety pin. Lay the faulty launcher aside; keep the muzzle pointed toward the target. Immediately use another launcher to engage the target. Dispose of or destroy the faulty launcher according to standard operating procedures.

Question 7

What are the characteristics of the M4 carbine?

Answer 7

Light weight, Air-cooled, Gas-operated, Magazine-fed, Semiautomatic or Fully Automatic, Shoulder fired weapon.

Weight:	6lb 7oz (without magazine and sling), 7.b 12oz (with loaded magazine and sling)
Caliber:	5.56mm (ball, blank, dummy, and tracer)
Length:	29.75in (buttstock closed), 33.0in (buttstock extended)
Muzzle Velocity:	2970fps
Maximum Range:	3600m
Maximum Effective Range:	500m (point), 600m (area)

Question 8

What is the sustained and cyclic rate of fire for the M4?

Answer 8

Sustained (12 – 15rpm), Cyclic (700 – 970rpm)

Question 9

State the TOA weapons allotment for an NMCB.

Answer 9

Weapon Qty
M4 580
M9 175
M2HB 12
MK-19 12
M-203 60
M-240B 28
M-500 40