OBJECTIVE
The student will be able to identify / discuss
the Characteristics, Parts of a Rifle,
General Data, Eight (8) cycle operation and
the disassembly / assembly of Rifle Cal.
5.56mm M16A1.
SCOPE OF THE LESSON
A. DESCRIPTION
B. Characteristics of Rifle Cal. 5.56mm
M16A1
C. Parts of the Rifle Cal. 5.56mm M16A1
E . General Data
F . Eight (8) Cycle Operation
G. Disassembly / Assembly of Rifle Cal.
5.56mm M16A1
* BODY/EXPLANATION
A. DESCRIPTION
B. CHARACTERISTIC
AIR COOLED
MAGAZINE FED
SHOULDER WEAPON
SEMI-AUTOMATIC OR AUTOMATIC
GAS OPERATED
Part of the Rifle Cal. 5.56mm M16A1
A) Two Main Group of Rifle M16A1
B) Part of the Upper Receiver Group
C) Part of the Lower Receiver Group:
PART OF THE RIFLE Cal. 5.56mm
M16A1 (LEFT SIDE)
PART OF THE Rifle Cal. 5.56mm
M16A1 ( RIGHT SIDE)
D. GENERAL DATA
A. WEIGHT:
1. Rifle w/o magazine & Sling -------------6.5 lbs
• 2. Rifle w/ 20 rds magazine ----------------7.5 lbs
• 3. Rifle w/ 30 rds magazine ----------------7.9 lbs
• 4. Empty magazine (20 rds)----------------.25 lbs
• 5. Empty magazine (30 rds)----------------.31 lbs
1. A. Length:
1. Rifle w/ bayonet knife---------------- 44.25 in
2. Rifle w/ flash suppressor---------------- 39 in
3. Rifle w/o flash suppressor ------------- 38 in
4. Barrel w/ flash suppressor ------------- 21 in
5. Barrel w/o flash suppressor------------ 20 in
C. SIGHT:
1. FRONT– Adjustable click-type post. Each click
equals 2.8 cm Per 100 mtrs of range.
2. REAR – adjustable flip-normal range setting is for 0
to 300 m Long range setting (L) 300-500 mtrs. Each
notch of The winding drum equals 2.8 cm per 100 mtrs
of Range.
BOLT CARRIER GROUP
D. Operational
1. Muzzle velocity ------- 3,250 fps
2. Cyclic rate of the fire-700-800 rpm
3. Maximum rate of fire
a) Semi-automatic -- 45-65 rpm
b) Automatic -------150-200 rpm
c) Sustained rate of fire—10-15 rpm
E. Ammunitions:
1. Cal 5.56mm
2. Type
Ball M193
Tracer M196
Blank M200
G. Eight (8) Cycle of Operation
1. Firing – occurs when the firing pin strikes
the primer of the cartridge.
2. Unlocking – unsealing the breach of the
barrel.
3. Extracting – removing the empty cartridge
from the receiver.
4. Ejecting – throwing out the empty cartridge
from the chamber
5. Feeding – placing a cartridge into the
receiver approximately at the
back of the barrel ready for chambering.
6. Chambering – moving the cartridge from
the magazine to the chamber.
7. Locking – sealing the cartridge from the
magazine to the chamber.
8. Cocking – is the positioning of the firing
mechanism in cock position so
that it is ready to fire another round.
E. Disassembly and Assembly of
the Weapon
A. Steps in disassembly
1. The first step in the disassembly of any weapon
is to “Clear the weapon”.
a. A. The butt must rest on a flat surface. The
right ting will do.
b. Point the selector lever to “SAFE” position.
(NOTE) This can be done only if the weapon is
cocked. If the rifle is not cocked, proceed to the
next step.
c. Grasp the magazine with the right hand, the
right thumb resting on the magazine catch bottom.
Press the bottom and pull the magazine.
d. Hold the balance of the stock with the left hand,
the left thumb resting on the bolt catch. Open the bolt
and lock if in the position. Return the charging
handle to forward position.
e. Ensure the selector lever at “SAFE”
CAUTION: The selector level must be at the “SAFE”
position when clearing weapon to prevent damage to
autos
1. Field Stripping
a. Disassembly:
(1) Remove the sling and place the rifle on a table or a
flat surface with the muzzle to the left.
(2) Turn the weapon on its right side and press on the
takedown pin until the upper receiver swings free of the
lower receiver. CAUTION: the takedown pin does not
come out free of the receiver.
(3) Press the receiver pivot pin and separate the upper
from the lower receiver group. (CAUTION): The receiver
pivot pin does not come out of the receiver.
1) Work on the upper receiver group:
(a) Keep the muzzle in the left.
(b) Withdraw the bolt carrier from the receiver
(c) Disassemble the bolt carrier group.
Note: When the bolt carrier is removed, the charging
handle will fall from the receiver.
(2) Work on the lower receiver group.
CAUTION: The lower receiver shall be disassembled
only when absolutely necessary for the proper care
and maintenance of the weapon.
(a) Push the action spring guide.
(b) Push down on the retaining pin by using
the tip of cartridge.
(c) Remove the buffer and buffer spring.
(d) Depress the hammer to clear the buffer.
Note: The action spring is under the pressure; care
must be taken in removing it.
CAUTION: The parts of the weapon should be laid
down in the order of its disassembly to avoid losses
or misplacement.
B. Assembly:
(1) Assembly the bolt carrier group:
Caution: Do not spread the ends of the firing pin
retainer
