Basic Ops/M9/M60

Question 1

8 Cycles of Operation

Answer 1

Feeding
Chambering
Locking
Firing
Unlocking
Extracting
Ejecting
Cocking

Question 2

Feeding Mechanisms

Answer 2

Magazines
Belts
Clips

Question 3

Types of Magazines

Answer 3

Staggered Box
— Rounds staggered side by side

In Line Box
— Rounds are one on top of other

Drum
— Circular, multiple rows of cartridges. May attach to top or bottom

Pan
— Cartridges are perpendicular to the axis of rotation, usually mounted on top of the weapon

Question 4

Belts

Answer 4

Split Link Disintegrating Metallic Link Belt (SLD MLB)

Split Link Non-Disintegrating Metallic Link Belt (SLND MLB)

Fully Encased Disintegrating Metallic Link Belt (FED MLB)

Fully Encased Non-Disintegrating Metallic Link Belt (FEND MLB)

Question 5

Clips

Answer 5

Used to rapidly load a weapon
•En Bloc
• Stripper Clip

Question 6

5 Types of Cartridges

Answer 6

Rimmed
• Cartridge head larger in diameter than the body forming a rim or flange

Semi-Rimmed
• A cartridge that has a head slightly larger in diameter than the body, with a shallow groove machined around the circumference of the body forward of the head to provide an extractor gripping surface

Rimless
• Head is the same diameter of the of body w/ a groove machined around the circumference of the body to provide an extractor gripping surface

Belted
• Rimless type, thick band or belt around the body just forward of the extractor groove to provide greater strength in that portion of the case

Rebated
• Base smaller than the case

Question 7

5 Firing Pins

Answer 7

Free Floating
• Larger Mass strikes firing pin, no spring used forward or rearward movement of firing pin

Inertia
• Forward energy is created when the hammer strikes firing pin. Pin driven forward by hammer, spring compresses creating energy needed to reset the firing pin

Percussion
• Firing pin driven forward by force of a compressed spring and retracted by cam action that cocks weapon

Striker
• Squeeze cocking system is what compresses firing pin spring

Fixed
• Own mass provides the energy

Question 8

Types of Primers

Answer 8

Boxer
• One flash hole, anvil is built in

Berdan
• Two flash holes, only contains flash powder, anvil is a part of cartridge case

Question 9

Locking Systems

Answer 9

• Rotating bolt
• Rising/Lowering bolt
• Roller
• Rising barrel
• Locking flaps
• Swinging bolt
• Locking block
• Rotating barrel

Question 10

Operating Systems

Answer 10

1. Bolt action
2. Blowback (no locking system)
3. Delayed blowback (locking system)
4. Recoil
5. Recoil w/ gas assist
6. Gas operation
7. Manual pump
8. Revolving cylinder

Question 11

Battle Sight

Answer 11

Range that allows you to hit between the throat and waist without sight adjustment

Question 12

Accelerator

Answer 12

Increases speed at which certain parts move, when the rate of movement of the bolt or breechblock is increased - rate of fire is increased

Question 13

Ballistics

Answer 13

Study of motion and impact of projectiles

Internal
• what happens when primer ignited and the bullet leaves the barrel

External
• path of bullet from muzzle to target

Terminal
• concerns after bullet hits target and what the bullet does upon impact

Question 14

Barrel

Answer 14

Portion of weapon which a projectile is propelled by gases generated from burning propellant charge

Question 15

Bolt

Answer 15

Main function is to support the base of the cartridge and seal the chamber when the cartridge is fired

Question 16

Bolt Carrier

Answer 16

Carries bolt; contains grooves, cams, or lugs that assist in locking the bolt in the forward position during firing

Question 17

Breech

Answer 17

Outside rear face of barrel which meets face of bolt

Question 18

Breechblock

Answer 18

Seals the breech and blocks gases from the fires cartridge forming exiting to the rear of the chamber

Question 19

Buffer

Answer 19

Absorb shock of moving parts or check motion of major components during recoil or counter recoil

Question 20

Caliber

Answer 20

Distance across bore of a weapon, measured from land to land, expressed in hundredths of an inch

Question 21

Chamber

Answer 21

Unrifled portion of the bore at the rear end of the barrel that receives and supports the cartridge when the breech is closed

Question 22

Compensator

Answer 22

Allows gases following bullet out of the muzzle to be deflected upward through slots in the top surface

Question 23

Disconnector

Answer 23

Prevents firing of more than one shot for one pull of the trigger or prevents weapon from being fired until it is in battery

Question 24

Flash suppressor

Answer 24

Cools gases as it leaves the muzzle reducing flash

Question 25

Headspace

Answer 25

Distance from breechblock to part of the chamber which stops the forward movement of the cartridge case

Question 26

Muzzle brake

Answer 26

Pulls weapon forward offsetting some of the rearward motion of recoil; gases direct out the sides and back

Question 27

Sear

Answer 27

Component retained under spring tension that releases either a firing pin, hammer, or bolt

Question 28

Trigger

Answer 28

Finger actuated lever used to activate the firing mechanism firing the weapon

Question 29

Trigger bar

Answer 29

Connecting bar operating between the trigger and the sear (extension of the trigger)

Question 30

M9

Answer 30

Italy Designation:M9 Pistol Cartridge:9x19MM Feed:15 round staggered box magazine Locking: Rising locking block System: Recoil, Semi Auto, DA & SA Range:50 Meters Applied Safety: Separates the firing pin from hammer, breaks connection of sear and hammer, lowers hammer PPF: Trigger Bar

Question 31

M60

Answer 31

USA Designation: M-60 Machine Gun Cartridge: 7.62 x 51MM Feed: 100 round SLD MLB Locking: Rotating bolt System: Gas Tappet, Auto only Range: 1100M Applied Safety: Blocks the sear PPF: Length of firing pin