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M249 Saw. TM9-1005-201-10 TM9-1005-201-23&P FM 23-14. Squad Automatic Weapon 5.56mm. M249 SAW, 5.56 mm. Purpose of Equipment: M249 machine gun is designed as a fire team automatic weapon, to make contact with and destroy enemy.

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M249 Saw



FM 23-14

Squad Automatic Weapon 5.56mm

M249 SAW, 5.56 mm

Purpose of Equipment: M249 machine gun is designed as a fire

team automatic weapon, to make contact with and destroy enemy.

The M249 machine gun can be used as a Squad Automatic Weapon

(SAW) or, as a Light Machine Gun (LMG).

It can be fired from the shoulder, or hand-held position, bipod

steadied position, tripod mounted position, or from pedestal ring

mount position.

M249 SAW, 5.56 mm

The M249 SAW is: Belt-fed, Gas operated, Air-cooled, and

Fires from the open bolt position.

Rifling is: Right hand twist, 1 turn in 7 inches.

Sights: Front………….Semi-fixed hooded post type.

Rear……Fully adjustable peep type for elevation & windage

M249 SAW, 5.56 mm

Range Maximum…………...3600 meters

Maximum effective…1000 meters

Rate of Fire: (new style barrel)

Cyclic……………...……850 rd./min.

Sustain (3-5 round burst)…50 rd./min

Rapid (8-10 round burst…100 rd./min..

Note: Rate of Fire for old style barrel was controlled by

gas regulator setting.

M249 SAW, 5.56 mm


Cocking Handle Assy

Heatshield Assy

Buttstock & Buffer Assy

Receiver Assy

100 or 200 rds Magazine


Trigger Assy

M249 SAW, 5.56 mm


Cover & Feed Mech. Assy

Barrel Assy

Front Sight

Rear Sight Assy

Bipod Assy

Feed Tray Assy

Hand Guard Assy

Sling Assy (not shown) is also a component to the weapon.

Cover and feed Mechanism assembly.

-Provides support for sight

and feeds linked belt ammo

and holds cartridges in

position for stripping.

Gas cylinder Assembly:

-locks bipod in place & provides passage-way for operating gases.

Old style

Hand guard assembly

New style

Slide assembly

Bolt assembly:

-houses firing pin & roller assembly

-provides feeding, stripping, chambering, firing, & extraction, using projectile gases for power.

Piston assy:

-holds bolt & slide assy & houses the return spring.

Drive spring:

-provides power to piston assy for moving slide & bolt assy forward.

-power from propelling gases to bolt & slide assy moves recoiling parts rearward.

Return rod & transfer Mech assy (new style)

-absorbs recoil for bolt, slide & piston

Operating rod assembly (0ld style):

-transfer recoil pressure to buffer in buttstock

-assembly is repairable & may be disassembled at organizational maintenance.


Bolt Assembly




Pin Guide

Note: Mandatory replacement of all 4 parts,

if extractor is taken apart for any reason.

Extractor Pin

All Bolt Assembly should be replaced with the new style that has the face of

the bolt modified with a cut-out that aids in extracting the cartridge case.

Cartridge Ejector

Left side of Receiver



Note: Tip of ejector must be well defined to ensure proper ejection.

Cleaning rods can easily damage ejector tip when they are used to

assure weapons are cleared on ranges.

Trigger mechanism assy.

-houses the trigger,sear, safety & controls the firing of the machine gun.


Red ring visible Ready to fire

Red ring not visible on safe.

Carrying Handle -fixed(non-folding)

Old Style Barrel

Flash Suppressor - minimizes muzzle flash

Gas Regular -is a two-position control to change the cyclic . Rate setting.

Carrying Handle - is


Compensator - minimizes flash, reduces & lessens muzzle climb.

New Style Barrel

Gas Regulator - has no effect on cyclic rate.

Buttstock and Buffer Assembly

- Solid molder design containing a

hydraulic buffer.

New style Buttstock

- Collapsible buttstock with buffer,

which can change the overall length

of the machine gun.

Stock Gun, Shoulder: M5

Old style Buttstock

- Light weight tubular design with

plastic web.

Contains no hydraulic buffer.