Station

Station Two has seven intermediate training objectives.

TASK: Perform operator's maintenance on the MK 19.

CONDITIONS: In any environment, the gunner is given a complete MK 19, cleaning equipment, tools, workspace, and TM 9-1010-230-10.

STANDARDS: Disassemble the MK 19 within four minutes. Use the cleaning materials as specified in the operator's TM to clean the MK 19. Inspect, lubricate, and assemble the MK 19 within four minutes, and perform a function check.

Intermediate Training Objective 1: The gunner must disassemble the MK 19.

CONDITIONS: The gunner is given a location in which to work, an assembled MK 19, weapon-cleaning equipment, lubricant, and TM 9-1010-230-10.

STANDARDS: The gunner must disassemble the MK 19 within four minutes.

PERFORMANCE MEASURES

GO

NO-GO

1. Clear the gun.

2. Remove the bolt and backplate assembly.

3. Remove the secondary drive lever.

4. Remove the feed slide assembly.

5. Remove the top cover assembly.

6. Remove the feed tray.

7. Remove the primary drive lever and vertical cam.

8. Remove the alignment guide assembly.

9. Remove the ogive plunger.

10. Remove the round-positioning block.

11. Remove the charger assemblies (left hand [LH], right hand [RH]).

12. Remove the sear assembly.

13. Complete within four minutes.

Intermediate Training Objective 2: Clean the MK 19.

CONDITIONS: The gunner is given a disassembled MK 19, with the proper cleaning equipment.

STANDARDS: The gunner must clean the MK 19.

PERFORMANCE MEASURES

GO

NO-GO

1. Receiver assembly:

a. Wipe or brush away dirt from all parts, especially the interior of the receiver housing, receiver rails, and feeder area.

b. Use a rag to apply the cleaning solvent.

c. Swab out the bore and chamber using a bore brush and RBC.

d. Wipe dry.

a. Wipe or brush away dirt.

b. Use a rag to apply the cleaning solvent.

c. Wipe dry.

3. Alignment guide assembly:

a. Wipe or brush away dirt.

b. Soak assembly in cleaning solvent.

c. Wipe dry.

4. Ogive plunger assembly:

a. Wipe or brush away dirt.

b. Use a rag to apply the cleaning solvent.

c. Wipe dry.

5. Round-positioning block:

a. Wipe or brush away dirt.

b. Soak in cleaning solvent.

6. Charger assemblies:

a. Wipe or brush away dirt.

b. Use a rag to apply cleaning solvent.

c. Wipe dry.

7. Vertical cam assembly:

a. Wipe or brush away dirt.

PERFORMANCE MEASURES

GO

NO-GO

b. Soak in cleaning solvent.

c. Wipe dry.

8. Primary drive lever:

a. Wipe or brush away dirt.

b. Soak in cleaning solvent.

c. Wipe dry.

9. Secondary drive lever:

a. Wipe or brush away dirt.

b. Soak in cleaning solvent.

c. Wipe dry.

10. Feed slide assembly:

a. Wipe or brush away dirt.

b. Use a rag to apply the cleaning solvent.

c. Wipe dry.

a. Wipe or brush away dirt.

b. Soak in cleaning solvent.

c. Wipe dry.

12. Top cover assembly:

a. Wipe or brush away dirt.

b. Use a rag to apply the cleaning solvent.

c. Wipe dry.

13. Bolt and backplate assembly:

a. Wipe or brush away dirt.

b. Use a rag to apply the cleaning solvent.

c. Wipe dry.

14. Use only authorized cleaning materials.

Intermediate Training Objective 3: Inspect the MK 19. CONDITIONS: The gunner is given a disassembled and cleaned MK 19. STANDARDS: The gunner must inspect the MK 19.

PERFORMANCE MEASURES

GO

NO-GO

1.

Receiver assembly:

a.

Inspect the receiver housing for cracks (even hairline), rust, burrs.

b.

Inspect the receiver rails for burrs, deformity, or unusual wear.

c.

Inspect the feeder pawls for spring action, burrs, or broken pawls.

d.

Inspect the barrel for carbon buildup or pitting in the bore or chamber.

e.

Inspect the flash suppressor for dents, cracks, or loose pin.

f.

Inspect the rear sight for rust, and the sight scale for readability.

2.

Sear assembly: Inspect for burrs, rust, or wear on sear face, or binding in the safety switch movement.

3.

Alignment guide assembly:

a.

Inspect for deformed or cracked spring.

b.

Inspect for cracks around the pin.

c.

Inspect for loose pin.

d.

Inspect for burrs, dents, and cracks.

4.

Ogive plunger assembly: Inspect for cracks in the housing.

5.

Round-positioning block:

a.

Inspect for burrs, dents, or cracks.

b.

Inspect for broken, deformed, or missing springs.

c.

Inspect for bent, cracked, or broken parts.

6.

Charger assemblies (LH, RH):

a.

Inspect for burrs on grooved edges.

PERFORMANCE MEASURES

GO

NO-GO

b. Inspect for chipped, cracked, broken, or missing handle assemblies.

c. Inspect for spring tension in the charger handle lock.

d. Inspect for spring tension in the lock plunger.

e. Inspect for bent charger housing.

7. Vertical cam assembly:

a. Inspect for burrs or buckling.

b. Inspect for scratches, chips, or aluminum buildup on the chromed edge.

c. Inspect for lock binding.

8. Primary drive lever: Inspect for burrs around the pivot post.

9. Secondary drive lever:

a. Inspect for burrs, cracks, chips, or buckling.

b. Inspect for missing retaining pin.

10. Feed slide assembly:

a. Inspect for burrs or cracks.

b. Inspect for broken feed pawls, binding, or no spring action.

c. Inspect for deformed shuttle-spring tip.

d. Inspect for loose mounting screws.

11. Feed tray:

a. Inspect for burrs or cracks.

b. Inspect for lack of spring action.

12. Top cover assembly:

a. Inspect for burrs, cracks, or rust.

b. Inspect for loose or missing latch.

c. Inspect for bent pins, and for missing or broken cross pins.

13. Bolt and backplate assembly:

a. Inspect overall for burrs, rust, or cracks.

PERFORMANCE MEASURES

GO

NO-GO

b. Inspect handles for cracks.

c. Inspect for broken or bent recoil springs.

d. Inspect for bent or broken guide rods.

e. Inspect for missing safety wire.

f. Inspect for broken or worn cocking lever.

g. Inspect for cracked or chipped bolt sear.

h. Inspect for cracked or binding cam followers.

i. Inspect for cracked or chipped bolt fingers.

j. Inspect for chipped or broken firing pin tip.

k. Inspect for chipped, cracked, or missing extractors.

l Inspect for bent or cracked backplate or missing ' retaining ring.

Intermediate Training Objective 4: Lubricate the MK 19.

CONDITIONS: The gunner is given a disassembled, cleaned, and inspected MK 19, and lubricant and brush.

STANDARDS: The gunner must lubricate the weapon.

PERFORMANCE MEASURES

GO

NO-GO

1.

Receiver assembly: Apply a light coat of lubricant on the receiver rails, feeder, and feeder pawls.

2.

Sear assembly: Apply a light coat to all parts.

3.

Alignment guide assembly: Apply a light coat to all parts.

4.

Round-positioning block: Apply a light coat to the springs.

5.

Charger assemblies (LH, RH): Apply a light coat to all parts, especially the grooved edges of the rails.

6.

Vertical cam: Apply a light coat to all parts, especially the chromed edge.

7.

Primary drive lever: Apply a light coat to all parts, especially the pivot posts.

8. 9.

Secondary drive lever: Apply a light coat to all parts, especially the pivot post and forked end.

10.

Feed slide assembly: Apply a light coat to all parts, especially the feed pawls.

Feed tray: Apply a light coat to all parts, especially the pawl and guide rails.

11.

Top cover assembly: Apply a light coat to all parts, especially the latch, the pivot post hole, and the pin holes.

12.

Bolt and backplate assembly: Apply a light coat to all parts, especially the bolt face, bolt sear, guide rods, recoil springs, bolt rails, cam followers, and cocking lever.

Intermediate Training Objective 5: Assemble the MK 19.

CONDITIONS: The gunner is given a disassembled, cleaned, inspected, and lubricated MK 19.

STANDARDS: The gunner must assemble the weapon in the proper sequence within four minutes.

PERFORMANCE MEASURES

GO

NO-GO

1. Assemble the sear assembly.

2. Assemble the charger assemblies (LH, RH).

3. Assemble the round-positioning block.

4. Insert the ogive plunger assembly.

5. Insert the alignment guide assembly.

6. Attach the vertical cam.

7. Attach the primary drive lever.

8. Attach the feed tray.

9. Attach the feed slide assembly.

10. Attach the top cover assembly.

11. Attach and engage the secondary drive lever.

12. Insert the bolt and backplate assembly.

13. Complete within four minutes.

Intermediate Training Objective 6: Perform a function check. CONDITIONS: The gunner is given an assembled MK 19. STANDARDS: The gunner must perform a function check on the weapon.

PERFORMANCE MEASURES

GO

NO-GO

1.

Close the top cover.

2.

Charge the weapon.

3.

Lock the charging handles forward.

4.

Place the gun on S (SAFE).

5.

Press the trigger.

6.

If the weapon fires, notify the supervisor.

8.

If the weapon does not fire, continue. Move the safety to F (FIRE).

9.

Press the trigger. Bolt should spring forward.

10.

Open the top cover.

11.

Check the tip of the firing pin. It should be exposed.

12.

Move the feed slide to the left.

13.

Close the top cover.

14.

Move the safety to S (SAFE).

Intermediate Training Objective 7: Clean, inspect, and lubricate the MK 64, MOD 7, gun cradle.

CONDITIONS: The gunner is given a gun cradle, TM 9-1010-231-13&P, and lubricant. STANDARDS: The gunner must clean, inspect, and lubricate the gun cradle.

PERFORMANCE MEASURES

GO

NO-GO

1. Clean the gun cradle.

a. Brush or wipe away dirt.

b. Use a rag to apply cleaning solvent.

2. Inspect the gun cradle for:

a. Bent or cracked retaining pins.

b. Damaged threads on depression stop.

c. Damage to mounting surface on the gun cradle.

d. Loss of mounting hardware (nuts, bolts, pins, or chains).

e. Depression stop in place (training use only).

f. Frozen pintle lock.

g. Missing cotter pins.

3 Lubricate the gun cradle. Apply a light coat to all pins and pivot points.

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