Machine Guns Flashcards
Sustained Rate of fire
M249
50 rounds/ minute
3 to 5 round bursts every 4-5 seconds
Barrel change every 10 minutes
Rapid Rate of fire M249
100 rounds/ minute
8 to 10 round bursts every 2-3 seconds
Barrel change every 2 minutes
Cyclic Rate of fire M249
650-850 rounds/ minute
Barrel change every 1 minute
Maximum range of M249
3600 m
Max effective range of M249
1000 m
Max effective ranges: Area and Point on tripod, M249
Area: 1000 m
Point: 800 m
Max effective ranges: Area and Point on bipod, M249
Area: 800 m
Point: 600 m
Sustained rate of fire M240B
100 rounds/ minute
6 to 9 round bursts every 4-5 seconds
Barrel change every 10 minutes
Rapid rate of fire M240B
200 rounds/ minute
10 to 13 round bursts every 2-3 seconds
Barrel change every 2 minutes
Cyclic rate of fire M240B
650-950 rounds/ minute
Barrel change every 1 minute
Maximum range of M240B
3725 m
Max effective range of M240B
1100 m
Max effective ranges: Area and Point on tripod, M240B
Area: 1100 m
Point: 800 m
Max effective ranges: Area and Point on bipod, M240B
Area: 800 m
Point: 600 m
Maximum Ordinate
Highest point of bullet trajectory between muzzle and target- about 2/3 distance from weapon to target
Cone of fire
How each round follows a slightly different trajectory, creating a cross sectional area where rounds travel
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
Danger space
Space between gun and target where rounds rise less than 1.8 meters above ground
Grazing fire
Where the center of the cone of fire rises less than 1 meter above ground
Plunging fire
When the danger space occurs exclusively within the beaten zone; when firing at long ranges or on sloping terrain
Frontal fire
When the long axis of the beaten zone is at a right angle to the front of the target
Flanking fire
Firing at the side of a target
Oblique fire
When the long axis of the beaten zone is at an angle other than perpendicular to the front of the target
Enfilade fire
When the long axis of the beaten zone coincides with the long axis of the target, can be frontal or flanking
Fixed fire
Where depth and width of beaten zone covers the target- one aiming point
Traversing fire
Changing direction left or right
Searching fire
Changing elevation- firing further or closer
Traversing and searching fire
Changing direction and elevation
Free gun
Rapid changes in direction and elevation- not accomplished w/ T&E
Sector of fire
Target area
Final Protective Fire- FPF
Immediately available, prearranged barrier of fire- prevents enemy movement across defensive lines
Final Protective Line- FPL
Predetermined line along which grazing fire is placed to stop an enemy assault- gun sights along FPL unless engaging other targets- part of unit FPF
Primary Direction of Fire- PDF
Main direction of fire
If an FPL is not given, becomes part of FPF
M192 Tripod traverse
900 mils (50.6 degrees)
PICMDEEP
Pairs Interlocking sectors Coordinated fires Mutual support (talking guns) Defilade- emplacement Enfilade- desired firing Economy of Fire Protection
