Answers: Quiz Number 2 - M16A1 Rifle

Quiz 2. U.S. Army Infantry Weapons of the Vietnam War, M16A1

Which statement best describes the M-16 Rifle?

Light weight, gas operated, air cooled, clip fed, selective rate shoulder fired weapon.
Light weight, gas operated, air cooled, magazine fed, selective rate shoulder fired weapon.
Light weight, recoil operated, air cooled, magazine fed, selective rate shoulder fired weapon.
Light weight, gas operated, air cooled, magazine fed, automatic fire shoulder fired weapon.

How much does the M-16 weigh with sling and 30-round magazine?

8.25 pounds (3.75 kilograms)
8.5 pounds (3.9 kilograms)
8.79 pounds (4 kilograms)
9.5 pounds (4.3 kilograms)

What rifle is shown on the Combat Infantryman's Badge (CIB)?

M1907 Springfield Rifle
1795 model Springfield Arsenal musket.
U.S. Rifle, Caliber .30, M1.
U.S. Rifle, M16A1E2

How many subassemblies does the M16 break down into?



	Four: (1) Bolt Carrier Assembly, (2) Charging Handle Assembly, (3) Upper Receiver and Barrel Assembly and (4) Lower Receiver and Buttstock Assembly.		Five: (1) Small Arms Sling, (2) Bolt Carrier Assembly, (3) Charging Handle Assembly, (4) Upper Receiver and Barrel Assembly and (5) Lower Receiver and Buttstock Assembly.
	Six: (1) Magazine, (2) Small Arms Sling, (3) Bolt Carrier Assembly, (4) Charging Handle Assembly, (5) Upper Receiver and Barrel Assembly (6) Lower Receiver & Buttstock Assembly		Eight: (1) Magazine, (2) Small Arms Sling, (3) Bolt Carrier Assembly, (4) Charging Handle Assembly, (5) Upper Receiver, (6) Barrel Assembly, (7) Lower Receiver Assembly, and (8) Buttstock Assembly.

What are the markings on standard-issue Colt-made production 20 round M16 magazines?

Pre-1967 magazines are marked "M16" and later magazines are marked "M16A1".
Pre-1970 magazines are marked "CAL. .223" and later magazines are marked "CAL. 5.56MM".
Pre-1985 magazines are marked "CAL. 5.56MM" and later magazines are marked "M4 Ball".
Pre-1969 magazines are marked "CAL. .223" and later magazines are marked "CAL. 5.56MM".

How many "effective" rounds do the 20 and 30 round magazines for the AR15/M16 hold?

Both 20 round capacity and 30 round capacity magazines should be loaded two rounds short to avoid jamming.
The 20 round capacity magazines hold 20 rounds and the 30s can be loaded with a full 30 rounds.
Both 20 round and 30 round capacity magazines can hold an extra round to fool the enemy.
20 round capacity magazines should never be loaded with more than 18 rounds, but the 30s take a full load.

What are the markings on standard-issue Colt-made production 30 round M16 magazines?

Pre-1967 magazines are marked "M16" and later magazines are marked "M16A1".
Pre-1970 magazines are marked "CAL. .223" and later magazines are marked "CAL. 5.56MM".
Pre-1985 magazines are marked "CAL. 5.56MM" and later magazines are marked "M4 Ball".
Pre-1969 magazines are marked "CAL. .223" and later magazines are marked "CAL. 5.56MM".

30 round magazines have various color followers. Which color follower is most in demand with collectors?

Black plastic followers, marked with the Colt pony and 5.56mm on the floorplate.
1975 to present.
Green plastic followers, marked with the Colt pony and 5.56mm on the floorplate.
Original Colt issue, pre-1975; excellent quality, value with collectors twice as high as the next best.
Green plastic followers, with manufacturer's name (Adventureline, Parsons, Labelle, Center, Okay) and city on floorplate.
Most common, 1975-1994,There were actually just two sets of contract 30 round magazine tooling, both built by Colt. They wandered around from contractor to contractor. These contracts were usually "minority or small business set- asides." Typically what would happen is a small business would get set up with the tooling, and start to crank out a contract. Then, the contract was so lucrative that the business no longer qualified as a "small business", the contractwas cancelled, and the tooling got yanked and sent on to the next contractor.
Green plastic followers, with manufacturer's name (Sanchez or Cooper's) and city on floorplate.
Some lots recalled for destruction by the military, due to poor tolerances.
Teflon-coated gray or black plastic followers marked with "Cal. 5.56mm", a part number, and "Made in U.S.A."
June 1995 to present. Current mil spec, banned for civilian market from Sept. 13, 1994
Black plastic followers, marked with "Colts Mfg. Co.", "CAL. 5.56" and the Colt pony on the floorplate,
Law enforcement sales, not sold on the civilian market.

What caliber is the M16 Rifle?

.16 caliber.
.30 caliber.
.45 caliber.
.223 caliber. "Caliber" refers to imperial (e.g., inches) measurements.
.556 caliber. .223 caliber equals 5.56 mm.

What was the maximum range of the M16 Rifle?

1,804.5 feet (550 meters) (maximum effective range, point target)
2,624.8 feet (800 meters) (maximum effective range, area targets)
2,800 feet (853 meters)
11,800 feet (3,600 meters) (maximum range)

Which statement best compares the basic difference between the M14 and the M16 that replaced it?

The M16 is shorter, lighter, has same maximum range as the M14, but is more effective within 215 yards (200m) or less.
The M16 is shorter, lighter, has a shorter maximum range than the M14, but is an automatic weapon.
The M16 is longer, lighter, has the same maximum range as the M14, but has a tighter shot group on full automatic.
The M16 is shorter, lighter, has a longer maximum range than the M14 and therefore makes a better sniper weapon.

What are the M16A1's normal modes of fire ?

single shot, semiautomatic and fully automatic selected through the use of a selector lever.
single shot, semiautomatic(three round bursts) and fully automatic selected through the use of trigger control.
semiautomatic (single shot) and automatic fire (3-round bursts) selected through the use of a selector lever.
fully automatic fire (full magazine), burst (3-rounds) or semiautomatic fire through the use of a selector lever.

How long is the M16A1, and how long is its barrel?

The M16A1 is 43 inches (109.22 cm) long and has a 24 inch (610mm) long barrel. (U.S. Rifle, Caliber .30, M1 specifications)
The M16A1 is 44.14 inches (112,1 cm) long and has a 22 inch (560mm) long barrel. (M14 specifications)
The M16A1 is 39.37 inches (1 meter) long and has a 20 inch (510mm) long barrel.
The M16A1 is 37.5 inches (95,25 cm) long and has an 20 inch (510mm) long barrel. (Original AR 15 specifications)

What is the M16A1's cyclic rate of fire?

1,000 rounds per minute
900 rounds per minute
800 rounds per minute (some sources say 750-900 rounds per minute)
700 rounds per minute (The cyclic rate of fire for the M16A2)

What rate of fire can be sustained indefinitely for the M16A1?

8-10 rounds per minute
12-15 rounds per minute
45 rounds per minute (semi-automatic firing rate)
90 rounds per minute (burst firing rate)

What is the muzzle velocity of the M16A1?

1,804.5 feet (550 meters) per second (maximum effective range, point target)
2,800 feet (853 meters) per second
2,624.8 feet (800 meters) per second (maximum effective range, area target)
11,800 feet (3,600 meters) per second (Maximum range)

Was the rear sight on the M16A1 changed with introduction of the M16A2?

No, both rear sights were fixed.
No, both rear sights were adjustable for elevation.
Yes, the fixed M16A1 rear sight was made adjustable for elevation on the M16A2.
Yes, the adjustable M16A1 rear sight was made fixed on the M16A2.

Which of the following modifications was NOT applied to the M16 to improve performance in Vietnam?

Development of a new powder specification to reduce fouling and decrease the rate of fire.
Actually, the solution was to bring back the original powder specification that had been relaxed during the construction cycle.
A new buffer to slow the rate of fire.
A new buttstock w/storage space for a cleaning kit.
A chrome plated chamber and barrel to improve rust resistance
A closed prong flash-hider that didn't snag on vegetation.
A 30-shot magazine to allow firing more ammunition between changing magazines.

Which best describes the safety catch on the normal M16-type safety?

A two-position safety switch on the left side flips rear for safe and forward for automatic fire.
A three-position safety switch on the left side flips rear for safe, vertical for single shot and forward for automatic fire.
A three-position safety switch on the left side flips forward for safe, vertical for automatic fire and rear for single shot.
A four-position safety switch flips rear for safe, up for single shot, down for semiautomatic and forward for automatic.

What is the acronym for immediate action with the M16 when a stoppage occurs?



	REEBA (1) Rounds. Failure to feed, chamber or lock. (2) Extract. Check for dirty or defective extractor. (3) Eject. Worn, stuck, damaged ejector or spring. (4) Bolt. Dirty bolt catch or faulty magazine. (5) Assembly. Check correctly assembled.		SPORT (1) Slap firmly on bottom of magazine. (2) Pull charging handle to the rear. (3) Observe chamber for ejection of round. (4) Release the charging handle. (5) Try to shoot (attempt to fire).
	STOP (1) Safety first. (2) Training. (3) Observe, (4) P,		CRAP (1) Clear rifle. (2) Reload. (3) Attempt to fire. (4) Place weapon on ground facing downrange       if cause is not corrected.