M240B Study Guide
 

Posted Sunday, June 25, 2006

What is the weight of the M240B?
Approximately 27.6 pounds

What Field Manual covers the M240B?
FM 3-22.68 Chapter 3

Describe the M240B.
The M240B is a belt-fed, air-cooled, gas-operated, fully automatic machine gun that fires from the open bolt position.

What is the sustained rate of fire for the M240B?
100 Rounds per minute fired in 6 to 9 round bursts and 4 to 5 seconds between bursts. Barrel change every 10 minutes.

What is the rapid rate of fire for the M240B?
200 Rounds per minute fired in 10 to 13 round bursts and 2 to 3 seconds between bursts. Barrel change every 2 minutes.

What is the cyclic rate of fire for the M240B?
650 to 950 Rounds per minute fired in continuous bursts. Barrel change every minute.

What is the maximum range of the M240B?
3725 meters

What is the maximum effective range of the M240B with tripod and T&E?
1100 meters

What is the maximum effective range of the M240B for an area target?
Tripod – 1,100 meters
Bipod – 800 meters

What is the maximum effective range of the M240B for a point target?
Tripod – 800 meters
Bipod – 600 meters

What is the length of the M240B?
49 inches

What is the maximum tracer burnout for the M240B?
900 meters

What types of ammunition can be used with M240B?

• M80 – Ball
• M61 – Armor Piercing
• M62 – Tracer
• M63 – Dummy
• M82 – Blank

What are the proper clearing procedures for the M240B?

1. Move the safety to the fire “F” position.
2. With his right hand, (palm up) pulls the cocking handle to the rear, ensuring the bolt is locked to the rear (bipod mode).
3. Return the cocking handle to its forward position.
4. Place the safety on safe “S.”
5. Raise the cover assembly and conduct the four-point safety check for brass, links, or ammunition.
• Check the feed pawl assembly under the cover.
• Check the feed tray.
• Lift the feed tray and inspects the chamber.
• Check the space between the face of the bolt and chamber to include the space under the bolt and operating rod assembly.
6. Close the feed tray and cover assembly and place the safety to the fire “F” position. Pull cocking handle to the rear, and pull the trigger while manually riding the bolt forward. Close the ejection port cover.

What are the proper procedures for performing a function check on the M240B?

1. Places the safety on “F.”
2. Pulls the cocking handle to the rear, locking the bolt to the rear of the receiver.
3. Returns the cocking handle to the forward position.
4. Places the safety on “S,” and closes the cover.
5. Pulls the trigger. (Bolt should not go forward).
6. Places the safety on “F.”
7. Pulls the cocking handle to the rear, pulls the trigger, and rides the bolt forward.
8. Closes the ejection port cover.