M at subcaliber tracer trainer

B-23. The M287 subcaliber tracer trainer (Figure B-10) uses the 9-mm M939 training practice-tracer (TP-T) cartridge. When loaded, this trainer simulates the M136 AT4 in weight, balance, and operation. The velocity and trajectory of its ammunition match that of the M136 AT4's HEAT cartridge, but the M287 produces less noise, backblast, and overpressure. The M287 subcaliber tracer trainer is used in place of the M136 AT4 in training.

Sub Calibre Trainer
BOLT

Figure B-10. M287 subcaliber tracer trainer.

Description

B-24. The M287 tracer trainer is a specially constructed M136 AT4. Unlike the LAW subcaliber trainer, it is not made from an expended launcher, so it has its own national stock number (NSN). It is designed to accept a special rifle barrel that fires a reduced-load 9-mm cartridge.

B-25. The M287 may be fired at stationary or moving targets. Before it can be fired at a target tank occupied by personnel, the parts of the tank that could suffer damage must be shielded. The local TSC can provide specifications for modifying tanks to be used as targets for the M287 tracer trainer.

B-26. Unlike the M136 AT4 itself and the FHT, the M287 has no band between the front and rear sights. The trainer has a 9-mm submachine gun barrel, a breech assembly, and a bolt (Figure B-11). The bolt is easily removed to load the 9-mm cartridges and to inspect the barrel for obstructions.

Firing Mechanism Bolt Action
BREECH ASSEMBLY

Figure B-11. M287 barrel assembly and components.

B-27. If the M287 tracer trainer is damaged, the unit armorer can replace its complete firing mechanism, firing rod, bolt, sights, sling, and 9-mm barrel assembly (Figure B-12).

Launcher Trainer M287

Figure B-12. Replaceable parts for the M287 tracer trainer.

Technical data

B-28. The following technical data apply to the M287 subcaliber tracer trainer: • Length: 1,020 millimeters (40 inches).

■ Rear: adjustable range, with two peepholes: 2-mm peephole for daylight and 7-mm peephole for limited visibility.

• Operating temperature: 10 to 27 degrees centigrade (0 to 100 degrees Fahrenheit).

• Muzzle velocity: 300 meters per second (984 feet per second).

Ammunition

B-29. The M939 9-mm tracer cartridge has a lighter powder charge than a standard 9-mm bullet. The lighter charge enables the cartridge to closely duplicate the trajectory of the M136 AT4 tactical round at ranges out to 700 meters. The M939 cartridge also has a tracer element to enable the firer to compare the impact of the cartridge with the sight picture. The firer can see the tracer out to 550 meters. Firing the M287 tracer trainer helps the firer learn the correct sight picture for moving targets. The cartridge's red tip and half-black base (Figure B-13) distinguishes it from standard 9-mm ammunition, which should never be fired from the M287 tracer trainer.

9mm Tracer
Figure B-13. M939, 9-mm tracer cartridge.

Function Check

B-30. Before the M287 is fired, a function check must be performed to ensure the trigger and safety mechanisms are operating properly. Function check procedures are shown in Table B-1. However, before performing a function check, ensure—

• The cocking lever is in the safe ("S") position.

• The transport safety pin is fully inserted, with the lanyard wrapped clockwise around the launcher.

• The bolt is removed from the breech.

Table B-1. Function check, M287 tracer trainer.

STEP

OPERATOR

FUNCTION

CORRECTIVE

ACTIONS

CHECK

MEASURES

1

Try to cock the tracer trainer.

It should not cock.

If it cocks, turn the trainer in for repair.

2

Remove the transport safety pin and depress the forward safety.

The forward safety should spring back when released.

If it does not spring back, turn the tracer trainer in for repair.

3

Cock the firing mechanism, pressing only the red trigger button.

The firing rod should move only slightly and should be captured by the safety lever assembly. No more than half the rod should protrude through the rear of the firing assembly.

If the tracer trainer fires, turn it in for repair.

4

Recock the firing mechanism; fully depress and continue to hold down the forward safety; press the red trigger button.

The tracer trainer should fire.

If the tracer trainer fails to fire, turn it in for repair.

5

Return the cocking lever to the SAFE position and reinstall the transport safety pin.

WARNING

Load live ammunition only on the firing line. Never fire the M287 tracer trainer at hard targets less than 125 meters from the firing line. Remain clear of the front of the M287, which must be pointed downrange at all times.

Loading

B-31. The M287 tracer trainer is loaded as follows:

• The firer performs the function check and places the M287 tracer trainer on his shoulder.

• The trainer looks through the barrel from the rear to verify that it contains no obstructions. He inspects the cartridge primer to ensure it is not dented, inserts the bolt into the breech (Figure B-14, page B-16), and presses in and turns the bolt clockwise to the safe position ("S") (Figure B-15, page B-16). He arms the tracer trainer by turning the bolt clockwise to the fire position ("F") (Figure B-16, page B-16).

• With the launcher still on his shoulder, the firer cocks the launcher by placing the cocking lever in the cocked position.

BOLT

Figure B-14. Inserting the bolt with the cartridge into the breech of the M287 tracer trainer.

Figure B-15. Tracer trainer bolt in the safe position ("S").
Figure B-16. Tracer trainer armed (firing position "F").

Unloading

B-32. With the tracer trainer still on the firer's shoulder, the trainer or instructor removes the bolt by turning it counterclockwise past the "S," then pulling the bolt from the breech (Figure B-17). If more rounds are to be fired, he removes the expended cartridge and reloads the bolt.

Figure B-17. Unloading the tracer trainer.

Reloading

B-33. With the tracer trainer still on his shoulder, the firer places the cocking lever in the safe position, keeping the tracer trainer on his shoulder and pointing toward the target. The trainer reloads the tracer trainer and prepares it for firing.

DANGER

NEVER TOUCH THE TRIGGER WHILE RELOADING.

Misfire Procedures

• Immediately shout "Misfire!"

• Release the forward safety, recock the launcher, and ensure the cocking lever is erect. Fully depress and hold down the forward safety, then aim and press the red trigger button.

• If the tracer trainer still fails to fire, repeat the two previous steps.

• If the launcher fails to fire again, release the forward safety, maintain your firing position, and return the cocking lever to the safe position.

• Notify the training supervisor.

• If a real misfire occurs that cannot be corrected by following the steps previously discussed, the trainer or assistant trainer on duty must ensure the cocking lever is in the safe position and that the forward safety is in the vertical position. He must then insert the transport safety pin and remove and inspect the cartridge. If the primer is dented, he replaces it, disposing of the old one IAW range safety SOP. If the primer is not dented, he notifies DS maintenance to inspect the bolt firing pin for damage. He then reloads the tracer trainer and continues the training exercise.

Range Procedures and Safety

B-35. These procedures are the same as for the M136 AT4.

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Responses

  • poppy boffin
    How to load a 9 mm bullet cartridge?
    8 years ago
  • Jody
    What is the LIN for the M287 subcaliber (cal) tracer trainer?
    5 months ago

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