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Flashcards in Machine Guns Deck (35)
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1

Sustained Rate of fire
M249

50 rounds/ minute
3 to 5 round bursts every 4-5 seconds
Barrel change every 10 minutes

2

Rapid Rate of fire M249

100 rounds/ minute
8 to 10 round bursts every 2-3 seconds
Barrel change every 2 minutes

3

Cyclic Rate of fire M249

650-850 rounds/ minute
Barrel change every 1 minute

4

Maximum range of M249

3600 m

5

Max effective range of M249

1000 m

6

Max effective ranges: Area and Point on tripod, M249

Area: 1000 m
Point: 800 m

7

Max effective ranges: Area and Point on bipod, M249

Area: 800 m
Point: 600 m

8

Sustained rate of fire M240B

100 rounds/ minute
6 to 9 round bursts every 4-5 seconds
Barrel change every 10 minutes

9

Rapid rate of fire M240B

200 rounds/ minute
10 to 13 round bursts every 2-3 seconds
Barrel change every 2 minutes

10

Cyclic rate of fire M240B

650-950 rounds/ minute
Barrel change every 1 minute

11

Maximum range of M240B

3725 m

12

Max effective range of M240B

1100 m

13

Max effective ranges: Area and Point on tripod, M240B

Area: 1100 m
Point: 800 m

14

Max effective ranges: Area and Point on bipod, M240B

Area: 800 m
Point: 600 m

15

Maximum Ordinate

Highest point of bullet trajectory between muzzle and target- about 2/3 distance from weapon to target

16

Cone of fire

How each round follows a slightly different trajectory, creating a cross sectional area where rounds travel

17

Beaten zone and how it changes w/ range and slope

Elliptical pattern formed on the ground by striking rounds
Short range/Downward slope- lengthens
Long range/Upward slope- shortens

18

Danger space

Space between gun and target where rounds rise less than 1.8 meters above ground

19

Grazing fire

Where the center of the cone of fire rises less than 1 meter above ground

20

Plunging fire

When the danger space occurs exclusively within the beaten zone; when firing at long ranges or on sloping terrain

21

Frontal fire

When the long axis of the beaten zone is at a right angle to the front of the target

22

Flanking fire

Firing at the side of a target

23

Oblique fire

When the long axis of the beaten zone is at an angle other than perpendicular to the front of the target

24

Enfilade fire

When the long axis of the beaten zone coincides with the long axis of the target, can be frontal or flanking

25

Fixed fire

Where depth and width of beaten zone covers the target- one aiming point

26

Traversing fire

Changing direction left or right

27

Searching fire

Changing elevation- firing further or closer

28

Traversing and searching fire

Changing direction and elevation

29

Free gun

Rapid changes in direction and elevation- not accomplished w/ T&E

30

Sector of fire

Target area