M240B MEDIUM MACHINE GUNS EXAM 2024

What are the characteristics of the M240B machine gun? B-A-G-F- - ANS-belt fed, air-cooled, gas-operated, fully automatic machine gun that fires from the OPEN bolt position What is the total weight of the M240B machine gun? - ANS-47.1 lbs What is the length of the M240B machine gun? - ANS-49 inches What is the SUSTAINED rate of fire of the M240B machine gun? - ANS-100 rpm What is the RAPID rate of fire of the M240B machine gun? - ANS-200 rpm What is the CYCLIC rate of fire of the M240B machine gun? - ANS-650 rpm What is the maximum range of the M240B machine gun? - ANS-3725 meters What is the maximum EFFECTIVE range of the M240B machine gun? - ANS-1800 meters (suppression) What is the grazing fire range for the M240B machine gun? - ANS-600 meters What are the (8) main components of the M240B machine gun? B-B-D-B-T-C-F-R - ANS-barrel assembly, butt-stock and buffer assembly, driving spring rod assembly, bolt and operating rod assembly, trigger-housing assembly, cover assembly, feed tray, receiver assembly What are the (7) cycles of operation of the M240B machine gun? F-C-F-U-E-E-C - ANS-Feeding, Chambering, Firing, Unlocking, Extracting, Ejecting, Cocking Which (5) types of ammo does the M240B machine gun fire? D-B-B-T-A - ANS-Dummy, blank, ball, tracer, armor-piercing Which (3) materials are used to clean the M240B machine gun? - ANS-Cleaning, lubricant, protectant (CLP) Rifle Bore Cleaner RBC Dry cleaning solvent Which (4) lubricants are used for the M240B machine gun? - ANS-Cleaning, lubricant, protectant (CLP) Lubricant, arctic weather (LAW) Lubricant, weapon, semi-fluid (LSA) Liquid solvent agent with Teflon (LSA-T) How many barrel clicks on the M240B machine gun indicate a possible barrel defect? - ANS-Fewer than 2 OR more than 7 clicks A failure of a weapon to function satisfactorily is called a what? - ANS-Malfunction Any interruption in the cycle of functioning is called a what? - ANS-Stoppage What are the two more common malfunctions of the M240B machine gun? - ANS-Sluggish operation Runaway Gun When a gun fires very slowly instead of at its normal rate, this is called what? - ANS-Sluggish operation When a gun continues to fire after the trigger is released, this is called what? - ANS-Runaway gun What is it called when the gunner/crew perform to reduce a stoppage, without investigating its cause, and quickly return the gun to action? - ANS-Immediate Action How do you stop a runaway gun? - ANS-Twist and (allow the gun to) break the belt of ammunition When the cartridge primer detonates after being struck by the firing pin, but some problem with the propellant powder causes it to burn too slowly and delays firing. - ANS-Hang Fire How many seconds do you wait to investigate after a stoppage? - ANS-5 seconds When the heat of the barrel is high enough to cause the propellant powder inside the round to ignite even though the primer is not struck is called what? - ANS-C