97th Security Forces Squadron

1
97th Security Forces Squadron

• Combat Arms Section

• Altus Air Force Base
• Oklahoma

2
M240B MACHINE GUN

• Air Force Qualification Course
• (AFQC)

3
COURSE OVERVIEW

• FIVE PERIODS OF INSTRUCTION
• I. ORIENTATION MECHANICAL
• II. TECHNIQUES OF FIRE EMPLOYMENT
• III. PREPARATORY MARKSMANSHIP
• IV. PERFORMANCE EVALUATION
• V. LIVE FIRE (PRACTICE QUALIFICATION
• FREQUENCY OF TRAINING
• 12 MONTHS

4
CLASSROOM PROCEDURES

• Training times Classroom, Live-Fire, Overall.
• Safety Precautions. (MSDSs in Office)
• Break procedures.
• Location of facilities
• Latrines.
• Smoking area.
• Telephones.
• Food Beverages.
• Student Critiques.

5
FORMS
6
SAFETY
7
WEAPON SAFETY

• Treat every weapon as if it were loaded.
• Never point a weapon at anyone or anything you do
  not intend to shoot.
• Always keep your finger away from the trigger of
  any weapon until you intend to shoot.
• Dont shoot anything you cant positively
  identify know whats behind it
• Always carry your weapon so that you can control
  the direction of the muzzle, even if you stumble.

8
CLASSROOM SAFETY

• Do not intentionally point the weapon at yourself
  or others during weapons handling exercises.
• Handle the weapon only when told to do so.
• No horseplay of any kind allowed
• Don't get ahead of the instructor and don't
  anticipate instructions.
• Dont let the bolt slam forward on an empty
  chamber
• If at any time you don't understand the
  instructions, ASK QUESTIONS!

9
M240B SAFETY

• Make sure the barrel is locked tightly before
  firing
• Ensure you only use the assigned barrel/spare
  barrel for your weapon. These barrels have been
  calibrated for this weapon. Rotate usage of the
  barrels
• Do not interchange barrel assembly or bolt
  assembly from one machine gun to another. Doings
  so can result in injury or even death!
• Never reload a runaway gun until it is repaired.
  Be sure machine gun is cleared before removing it
  from a vehicle or tripod mount
• A hot barrel can burn you. If barrel is hot, use
  your heat resistant mittens.

10
CHARACTERISTICS
11
DESCRIPTION

• AIR COOLED
• BELT-FED DISINTEGRATING METALLIC SPLIT BELT
• GAS OPERATED
• FIXED HEADSPACE
• FIRES FROM OPEN BOLT POSITION
• FIRES 7.62 X 51mm NATO (.308 cal)

12
CHARACTERISTICS PERFORMANCE

• Manufacturer FN
  MFG.
• Weight 27.6 lb.
  (12.52 kg)
• Length 49 inches
  (overall)
• Maximum adjustable range 1,800 meters
• Maximum range 3,725 meters
• Maximum effective range
• Point Target (with tripod) 800 meters
• Area Target (with tripod) 1800 meters
• Tracer Burnout 900 meters

13
RATES OF FIRE

• SUSTAINED
• 100 RPM (rounds per minute)
• 6-9 round bursts with 2-3 seconds between bursts
• Barrel change every 10 minutes
• RAPID
• 200 RPM (rounds per minute)
• 6-9 round bursts with 2-3 seconds between bursts
• Barrel change every 2 minutes
• CYCLIC
• 650-950 RPM (rounds per minute)
• Barrel change every 1 minute

14
AMMUNITION
15
AMMUNITION

• BALL M80
• Copper gilded projectile
• Plain Tip
• Used on personnel light material targets

16
AMMUNITION (Cont)

• TRACER M62
• Copper gilded projectile
• Orange or Red painted tip
• Usage
• Fire observation
• Short range incendiary effect
• Signaling

17
AMMUNITION

• BLANK M82
• No projectile
• Used for simulating live fire (training with
  blank fire adapter (BFA) only)

18
AMMUNITION

• DUMMY M63
• Case is corrugated or has three holes drilled in
  case
• No primer or powder
• Solid Black

19
AMMUNITION

• ARMOR-PIERCING M61
• Copper gilded projectile
• Black painted tip
• For lightly armored targets

20
AMMUNITION (Cont)

• PACKAGING
• BULK ISSUE
• 1,500 round cans
• BANDOLEER
• 100 round assault packs
• 200 rounds per can

21
CARE, HANDLING, STORAGE OF AMMO

• Dont open container until needed
• Dont expose to prolong sunlight. Keep covered
  with tarps, cammo netting, etc.
• Dont oil or grease ammo
• Store ammo minimum 6 inches off ground and allow
  for ventilation

22
NOMENCLATURE
23
NOMENCLATURE

• Eight Major Components
• Barrel Assembly
• Buffer Assembly
• Driving Spring Rod Assembly
• Bolt Operating Rod Assembly

24
NOMENCLATURE
Eight Major Components (Cont) 5. Trigger Housing
Assembly 6. Cover Assembly 7. Feed Tray
Assembly 8. Receiver Assembly
25
BARREL COMPONENTS
Flash Suppressor
Gas Regulator Plug
Front Sight Assembly
Barrel
Barrel Carrying Handle Assembly

26
BUTTSTOCK BUFFER COMPONENTS
Buttstock
Buffer Catch
Butt Plate
27
TRIGGER HOUSING COMPONENTS
Trigger Assembly
Safety
Grips
28
COVER COMPONENTS
Accessory Mounting Rail
Cover
29
RECEIVER COMPONENTS
Handguard
Cocking Assembly
Rear Sight Assembly
Bipod Assembly
Barrel Locking Latch
Ejection Port Cover
30
METHODS OF DESTRUCTION

• MECHANICAL
• BURNING
• DEMOLITION
• DISPOSAL
• GUNFIRE
• MAY USE A COMBINATION OF ALL METHODS
• LOCAL COMMANDERS DECISION

31
CLEARING, LOADING, RELOADING
32
CLEARING PROCEDURES

• Place SAFETY to Fire
• 2. Lock Bolt to the rear and return Cocking
  Handle Forward
• 3. Place SAFETY to SAFE

33
CLEARING PROCEDURES

• 4. Push in latches and open cover assembly
• 5. Remove Ammunition if present

34
CLEARING PROCEDURES

• 6. Raise Feed tray
• 7. Conduct 4 point check
• a. Check feed pawl assembly under cover
• b. Check Feed Tray
• c. Lift the tray and inspect the chamber
• d. Check the Receiver
• 8. Lower Feed Tray

35
CLEARING PROCEDURES

• 9. Place Safety to FIRE
• 10. Hold Cocking Handle to the rear, squeeze
  trigger, and ease bolt forward to close lock
• 11. Close cover assembly. Ensure it locks shut

36
LOADING PROCEDURES

• 1. Clear weapon (leaving cover open)
• 2. Place link belt in feed tray with first round
  against cartridge stop and open side of links
  down
• 3. Close Cover, make sure it locks shut

37
LOADING PROCEDURES

• 4. Pull Cocking Handle to the rear and return the
  Cocking Handle to forward position
• 5. If weapon is not to be fired immediately,
  place Safety to S (safe)

38
OPERATOR MAINTENANCE
39
DISASSEMBLY

• Field Strip of M240B into eight (8) major groups

40
DISASSEMBLY

• Clear Weapon
• Depress Barrel locking latch (A) and hold
• Turn Barrel Release/Carrying Handle to upright
  position (B)
• Remove Barrel. Push forward and lift barrel out
• NOTE BE SURE BOLT IS FORWARD OR RECEIVER CAN BE
  DAMAGED

41
DISASSEMBLY

• Remove Heat Shied Assembly from Barrel. Lift
  rear of Heat Shield Assembly off Barrel then pry
  front tabs out of holes on gas hole bushing

42
DISASSEMBLY

• Depress spring and remove Trigger Spring Pin
• Pull Trigger Housing down and back to remove

43
DISASSEMBLY

• Depress Back Plate Latch and lift buffer/stock
  assembly straight up

44
DISASSEMBLY

• Press Spring in, up and then pull out

45
DISASSEMBLY

• Depress Cover Latches and raise Cover Assembly
• Pull Cocking Handle back, the pull Bolt
  Operating Rod Assembly out

46
DISASSEMBLY

• Close Cover
• Push out Spring Pin (A) as far as possible with
  the back of buffer
• Remove Pin with fingers (B)
• Depress Cover Latches, lift upwards and remove
  Cover Assembly (C)
• Remove Feed Tray (D)

47
DISASSEMBLY

• Extend Bipod Legs to down and locked position (1)
• Pull Hand guard straight down and off Gas Cylinder

48
CLEANING INSPECTION PROCEDURES
49
CLEANING NOTES

• Be sure weapon is cleared before disassembly.
  Cleaning, inspecting, transporting, storing
• Using Gasoline, Kerosene, Hydraulic Oil, Benzine,
  Bensol, high-pressure water, steam, or air for
  cleaning is PROHIBITED
• Do not use abrasives to clean the bore, piston,
  gas cylinder, or gas regulator plug
• Do not apply lubricants to composite/rubber
  components
• Only use CLP or LSA/RBC to clean/lubricate the
  weapon

50
CLEANING INSPECTION

• Gas System
• Press and rotate collar counterclockwise, until
  it releases then pull it out
• Pull Gas Regulator Plug from Gas Hole Bushing

51
CLEANING INSPECTION

• Gas System
• Remove Cover from Scraper
• Insert scraper into center hole of gas Regulator
  Plug
• Twist scraper clockwise to remove carbon from
  center hole until scraper is fully seated against
  Gas Regulator Plug

52
CLEANING INSPECTION

• Gas System
• Fold scraper and press point into groove. Turn
  gas regulator plug clockwise to remove carbon
  from groove on gas regulator plug.
• Pivot scraper blade 180 to opposite side and
  place groove tip of scraper into groove of gas
  regulator plug and turn clockwise to remove
  carbon from groove on plug.

53
CLEANING INSPECTION

• Gas System
• With tip of scraper, scrape carbon from surface
  of gas regulator plug.
• Insert small reamer into each gas inlet hole of
  gas regulator plug and twist back and forth to
  remove the carbon.

54
CLEANING INSPECTION

• Gas System
• Insert large reamer through hole in gas port
  bushing into gas port hole in barrel and twist
  back and forth until reamer enters bore of barrel
  to remove carbon.

55
CLEANING INSPECTION

• Barrel
• Remove dirt and corrosion from bore using
  cleaning rod and swab dampened with CLP
• Remove dirt and corrosion from other parts using
  wiping rag dampened with CLP or RBC
• Inspect for cracks, dents, burrs, or other damage
  on flash suppressor, barrel adapter, barrel
  carrying handle, barrel release, and front sight

56
CLEANING INSPECTION

• Barrel
• Clean the bore using CLP or RBC and a bore brush
  with a cleaning rod. Do not reverse direction of
  the bore brush while it is in the bore.
• Run the brush through the bore several times
  until most of the powder fouling and other
  foreign matter has been removed.
• Swab out the bore several times using a cleaning
  rod and a swab wet with CLP.
• Swab out the bore several times using a cleaning
  rod and a dry swab.
• Clean the chamber using CLP and a chamber brush
  attached to a cleaning rod.
• Run the brush through the chamber several times
  until most of the powder fouling and other
  foreign matter has been removed.
• Swab out the chamber several times using a
  cleaning rod and a swab wet with CLP.
• Swab out the chamber several times using a
  cleaning rod and a dry swab.

57
CLEANING INSPECTION

• Barrel
• Remove dirt and corrosion from bore using
  cleaning rod and swab dampened with CLP
• Remove dirt and corrosion from other parts using
  wiping rag dampened with CLP or RBC
• Inspect for cracks, dents, burrs, or other damage
  on flash suppressor, barrel adapter, barrel
  carrying handle, barrel release, and front sight

58
CLEANING INSPECTION

• Gas System Re-assembly
• The plug is designed with three gas inlet
  settings to maintain the rate of fire. This
  design is intended to maintain a consistent rate
  of fire under adverse conditions and NOT TO
  INCREASE YOUR RATE OF FIRE.
• Gas inlet setting number 1 (number facing the
  barrel) is preferred for normal conditions.
• Setting 2 and 3 are not intended to increase your
  rate of fire. Gas inlet setting number 1 is
  preferred for normal operating conditions.

59
CLEANING INSPECTION

• Gas System Re-assembly
• Place gas regulator plug with gas inlet setting
  number 1 hole facing the barrel.
• Install collar on gas regulator plug. Rotate
  collar until it skips onto gas regulator plug.
  Press in and rotate to lock in place (pull collar
  to be sure it is in the locked position).

60
CLEANING INSPECTION

• Gas System Re-assembly
• Install heat shield on barrel. Make sure front
  tabs snap into hole on gas hole bushing, then
  push down onto barrel

61
CLEANING INSPECTION

• Cover Assembly
• CAUTION-- Do not use brushes when cleaning cover
  assembly, use clean rag only.
• Check cover assembly for smooth operation, spring
  tension, bent or missing parts, or excessive wear.

(0) Lubrication Points
62
CLEANING INSPECTION

• Cover Assembly
• Check accessory mounting rail for nicks or burrs
  which will prevent proper attachment of optional
  sighting devices

63
CLEANING INSPECTION

• Cocking Handle Receiver
• Check for bends and cracks, free movement of
  cocking handle assembly, and excessively worn,
  burred, or chipped rails.
• Check barrel locking latch and cover detent for
  proper spring tension.

64
CLEANING INSPECTION

• Trigger
• Check for broken grips, and chipped or cracked
  trigger housing holding lug. Ensure trigger guard
  does not interfere with full operation of trigger
• Check tripping lever and sear for burrs, cracks,
  chips, and wear.
• Notify Combat Arms if problems exists.

65
CLEANING INSPECTION

• Trigger
• Check cocking action by pushing back on tripping
  lever (sear will raise). Pull trigger (sear will
  lower).
• Check safety functions. When safety is placed to
  " S" pull trigger (sear will not lower). When
  safety is placed to "F", pull trigger (sear will
  lower).
• Lightly lubricate tripping lever and sear
  surfaces.
• NOTE--To place safety to "S" the sear must be up.

66
CLEANING INSPECTION

• Op Rod
• Insert combination tool into bottom of cavity of
  piston end of operating rod. Squeeze handles
  firmly and twist combination tool clockwise to
  remove carbon.
• Insert screwdriver end of combination tool into
  cavity of piston end of operating rod to remove
  carbon residue in bottom of cavity.
• Clean all other areas of operating rod, firing
  pin, and spring pin with a rag dampened with CLP,
  Lightly oil after cleaning.

67
CLEANING INSPECTION

• Bolt Op Rod
• Check bolt and operating rod assembly for burrs,
  cracks, broken pins, or frozen roller. Push down
  on roller to make sure it will retract. Check
  driving spring for broken strands. Notify Combat
  Arms if two or more broken strands are found
  within a one inch area
• NOTE --Do not lubricate face of bolt. Do not oil
  piston.
• O - Lightly oil driving spring. Lightly oil bolt
  and operating rod assembly moving parts, polished
  areas, firing pin, and roller.

68
CLEANING INSPECTION

• Gas Cylinder/Receiver
• Insert combination tool with handle upward
  carefully into the fore end of the gas cylinder
  of the receiver body.
• Be sure the combination tool shoulder is fully
  inserted and seated against the fore end of gas
  cylinder in receiver body.
• Apply slight pressure to handles and turn
  combination tool clockwise to remove carbon.
• CAUTION
• If combination tool is not properly seated, it
  could cause damage to smaller diameter of gas
  cylinder.

69
CLEANING INSPECTION

• Gas Cylinder/Receiver
• Clean gas cylinder bore with gas cylinder
  cleaning brush dampened with CLP or RBC
• With wiping rag dampened with CLP or RBC, remove
  dirt and corrosion from area under front access
  cover of receiver and all other parts and areas.
• Ensure proper operation of ejection port cover
  and bipod latch

70
CLEANING INSPECTION

• Gas Cylinder/Receiver
• Clean gas cylinder bore with gas cylinder
  cleaning brush dampened with CLP or RBC
• With wiping rag dampened with CLP or RBC, remove
  dirt and corrosion from area under front access
  cover of receiver and all other parts and areas.
• Ensure proper operation of ejection port cover
  and bipod latch

71
CLEANING INSPECTION

• Gas Cylinder/Receiver
• Clean the receiver using a receiver brush and
  CLP.
• Brush the receiver until most of the powder
  fouling and other foreign matter is removed.
• Swab out the receiver several times using a
  cleaning rod section and a swab wet with CLP.
• Swab out the receiver several times using a
  cleaning rod section and a dry swab.

72
PREVENTIVE MAINTENANCE INSPECTION
73
PM INSPECTION

• Buttstock
• Inspect buttstock for cracks
• Check to ensure back plate latch locks buffer
  assembly when installed
• Hydraulic Buffer Assembly
• Check for burrs or rough edges on mating grooves
  flanges
• Check Buffer for leaks
• Check buffer for looseness in backplate

74
PM INSPECTION

• Driving Spring Rod Assembly
• Check spring for broken stands
• Replace Spring Rod Assembly if two strands are
  broken on the same coil or three or more strands
  are broken, regardless of location on the same
  spring
• Make sure driving spring rod assembly is not bent

75
PM INSPECTION

• Bolt Op Rod Assembly
• Check firing pin to make sure its straight has
  a smooth round tip
• Make sure the ball end is installed between the
  spring pin and bottom of groove

76
PM INSPECTION

• Trigger Housing Assembly
• Inspect tripping lever and sear for burrs on
  edges or shoulders.
• Push back on tripping lever to raise sear.
• Place safety to safe, pull trigger, sear should
  not drop down far enough to lock in the downward
  position.
• Place safety to fire, pull trigger, sear should
  drop down and lock in the downward position.
• Check for cracked grips.
• Check sear spring to make sure the leg of the
  sear spring is behind trigger pin and not between
  the trigger and the pin.
• Check grip assembly for loose or missing grip
  screws.
• Check trigger guard for bends or cracks.

77
PM INSPECTION

• Cover Assembly
• Pivot feed lever back and forth to make sure the
  feed mechanism operates smoothly without binding.
  
• Push in on cover latches to make sure retaining
  clip is not weak or missing and cover latches do
  not bind in the housing.
• Push down on cartridge guides and feed pawls to
  make sure springs are not weak or missing.
• Inspect accessory mounting rail for nicks or
  burrs.

78
PM INSPECTION

• Feed Tray
• Check feed tray for cracks, deformation, broken
  welds, and loose rivets.
• Check for chips and burrs on tray face.
• Handguard
• Check handguard for cracks, broken or missing
  parts.
• Bipod
• Check bipod legs for cracks, twisted, or
  incomplete assembly.

79
PM INSPECTION

• Receiver Assembly
• Check that rear sight assembly is securely
  mounted to receiver assembly and operates
  properly.
• Check that manual control handle operates slide
  properly.
• Check for damaged or missing ejection port cover,
  spring and pin.
• Check for damage to interrupted threads in
  receiver.

80
PM INSPECTION

• Machine Gun
• Be sure parts are installed correctly and are in
  good working condition.
• When installing the barrel assembly in the
  receiver, push the barrel release/manual control
  handle firmly to the right and count the clicks.
  Fewer than 2 or more than 7 clicks indicate
  defective parts. (Ensure the spare barrel is
  checked also).
• Check weapon functioning with belted dummy ammo.
• NOTE
• Both barrels and bolt assembly must accompany
  receiver when weapon is turned in.

81
ASSEMBLEWEAPON
82
ASSEMBLY

• Position feed tray and cover assembly, push cover
  assembly forward, close cover and insert spring
  pin. Insert spring pin from right side.
• Open cover assembly. Be sure cover detent holds
  cover assembly open. Cover assembly must remain
  open in two positions, if not, replace.

83
ASSEMBLY

• Set bolt and operating rod assembly on top of
  receiver rails. Extend bolt to unlocked position,
  then push the assembly all the way to the
  receiver. Close cover assembly and lock

84
ASSEMBLY

• Insert driving spring into operating rod
  assembly. Push it in fully and lower it to seat
  the stud in hole of receiver
• Install buffer assembly and buttstock and make
  sure it latches.

85
ASSEMBLY

• Position trigger housing assembly into place.
• NOTE
• Place safety in fire position, position front of
  housing assembly into place and pivot into
  position.
• Insert spring pin.
• NOTE
• Pin can be inserted from either side. For the
  M240B, pin must be installed from the right side
  only.

86
ASSEMBLY

• Install heat shield on barrel. Make sure front
  tabs snap into hole on gas hole bushing, then
  push down onto barrel

87
ASSEMBLY

• NOTE
• Before firing, make sure the barrel is locked
  tightly in the receiver. If the barrel is not
  locked tight, threads in receiver could be
  damaged or cause personal injury.
• NOTE
• Barrel release must be in the upright position
  when installing barrel.
• Insert barrel fully into socket and push barrel
  release/barrel carrying handle to the right as
  far as it will go (fewer than 2 or more than 7
  clicks indicate defective parts) to lock. Do not
  force. If barrel binds in socket or if barrel
  release/barrel carrying handle will not rotate
  when pushed, do not pound on barrel
  release/barrel carrying handle.

88
FUNCTION CHECK
89
FUNCTION CHECK

• Clear Weapon
• Place the safety on F (fire).
• Pull cocking handle to the rear, locking the bolt
  to the rear of the receiver.
• Return the cocking handle to the forward
  position.
• Place the safety on S (safe)
• Pull trigger, nothing should happen
• Safety lever on F (fire).
• Pull cocking handle to the rear, pull the
  trigger, and ride the bolt forward to close and
  lock.

90
MALFUNCTIONS, STOPPAGES, IMMEDIATE ACTION
91
DEFINITIONS

• STOPPAGE - ANY INTERRUPTION IN THE CYCLE OF
  OPERATION. A STOPPAGE MAY OR MAY NOT BE CAUSED
  BY THE WEAPON FUNCTIONING IMPROPERLY
• MALFUNCTION - A FAILURE OF THE WEAPON TO FUNCTION
  PROPERLY. A MALFUNCTION CAN USUALLY BE
  PINPOINTED TO SPECIFIC PART BREAKAGE OR EXCESSIVE
  WEAR

92
DEFINITIONS

• IMMEDITATE ACTIONS- Prompt actions taken by the
  crew to over come the stoppage
• COOK-OFF- Ignition of a chambered round of
  ammunition due to the heat of the weapon
• MISFIRE- Failure of a chambered round to misfire

93
DEFINITIONS

• HOT or COLD GUN- this is a peacetime
  classification only. The gun will only be
  classified as hot or cold only in the interest of
  safety
• Hot gun more than 200 rounds fired within a
  2-minute period.
• A long continuous burst or repeated firing of
  the weapon even though you do not reach 200
  rounds in two minutes.
• Less than 15 minutes have lapsed without a round
  being fired from a hot gun.
• If the vehicle commander for any reason decides
  the weapon is hot.

94
DEFINITIONS

• HOT or COLD GUN-
• WARNING
• If nothing is ejected and you have a hot gun (200
  rounds within a 2 minute period). Do not open the
  cover. Place safety to safe, keep machine gun
  pointed down range, and remain away from machine
  gun for 15 minutes. After 15 minutes, clear your
  machine gun.
• The climate temperature in different regions will
  make a difference as to what constitutes a hot
  gun. A hot, sunny day can cause a cook-off within
  50 rounds, with the weapon and ammunition in sun.

95
STOPPAGES

• Failure to Chamber
• Damaged driving spring rod assembly replace
  driving spring rod assembly.
• Damaged gas plug replace plug.
• Caked carbon in plug, gas cylinder piston, or
  receiver remove carbon and clean.
• Failure to Fire
• Damaged driving spring rod assembly replace
  driving spring rod assembly.
• Broken or damaged firing pin replace firing pin.

96
STOPPAGES

• Sluggish Operation
• Dirty receiver and lack of lubrication clean
  and lubricate.
• Loose rivets causing drag on bolt/operating rod
  assembly repair or return to depot as
  appropriate.
• Failure to Feed
• Insufficient gas pressure clean gas port hole,
  gas inlets, and gas plug (check for
  oversized/out-of-round gas inlets).
• Broken or damaged feed tray and cover assembly
  replace feed tray or cover assembly.
• Broken or damaged driving spring rod assembly
  replace driving spring rod assembly.

97
STOPPAGES

• Failure to Eject
• Frozen or damaged ejector or ejector spring
  replace unserviceable parts.
• Insufficient gas pressure clean gas port hole,
  gas inlets, and gas plug.
• Failure to extract
• Damaged or broken extractor, extractor plunger,
  or spring assembly replace unserviceable parts.
• Insufficient gas pressure clean gas port hole,
  gas inlets, and gas plug.

98
STOPPAGES

• Failure to Cock or Runaway Gun
• Broken, stuck, or worn sear replace
  unserviceable parts.
• Broken, stuck, or worn tripping lever replace
  unserviceable parts.
• Broken or damaged sear spring replace
  unserviceable parts.

99
IMMEDIATE ACTIONS

• Pull cocking handle to rear.
• Attempt to Fire.
• If the gun does not fire, pull cocking handle
  rearward to lock bolt assembly back.
• Return cocking handle forward.
• Place safety on Safe.
• If hot gun during training keep pointed down
  range for 15 minutes then perform remedial
  action. In combat, situation dictates procedures.
  
• If cold gun perform remedial action.

100
REMEDIAL ACTION (investigate cause of stoppage)

• 1. Clear weapon
• 2. Visually Inspect Weapon
• 3. Reload and attempt to fire
• 4. Still doesnt work
• Replace weapon, turn in to Combat Arms

101
REMEDIAL ACTION (for a Runaway Gun)

• WARNING
• Always keep machine gun pointed down range.
• Never reload a runaway machine gun until it is
  repaired.
• Be sure machine gun is cleared before removing it
  from vehicle/tripod mount.

102
REMEDIAL ACTION (for a Runaway Gun)

• If runaway occurs (machine gun wont stop
  firing), take any of the 3 actions below to stop
  the runaway gun.
• Let machine gun fire continue to fire if near end
  of link belt.
• Break link belt (grasp belt and twist it firmly).
  
• Grab cocking handle and pull all the way back and
  hold. Place safety to safe and remove ammunition
  belt.
• Notify combat arms personnel for repair.

103
REMEDIAL ACTION (Stuck cartridge case/live round)

• WARNING
• Stay clear of muzzle. Do not allow round to hit
  any hard surface or it may fire. Dispose of live
  round in accordance with regulations.

104
REMEDIAL ACTION (Stuck cartridge case/live round)

• If it did fire and didnt extract, you have a
  stuck cartridge case. If it didnt fire and
  didnt extract, you have a stuck live round.
• Charge the weapon.
• Place safety to S.
• Push cocking handle to forward position.
• Wait until barrel is cool, remove barrel, and
  remove cartridge case from chamber of barrel.
• Remove swab holder section from cleaning rod and
  insert cleaning rod through muzzle end of barrel
  and gently tap out cartridge.
• Push end of cleaning rod against stuck case. Push
  cleaning rod to remove case with weapon in
  mounted position.

105
TEs
106
T E NOMENCLATURE

• Gas Cylinder/Receiver
• Clean gas cylinder bore with gas cylinder
  cleaning brush dampened with CLP or RBC
• With wiping rag dampened with CLP or RBC, remove
  dirt and corrosion from area under front access
  cover of receiver and all other parts and areas.
• Ensure proper operation of ejection port cover
  and bipod latch

107
97th Security Forces Squadron

• Combat Arms Section

• Altus Air Force Base
• Oklahoma