Manaul 468 Barrett M468 Manual

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1

Responsibility

This manual provides instructions on the operation and maintenance of the Barrett model

M468 rifle. Read and understand it carefully before you try to use your rifle. Your

safety, and that of those around you, depends on your knowledge of your rifle and on your

knowledge of safety rules common to all firearms. Please study the common-sense safety

rules noted in this manual. Your first concern as a gun owner should always be safety.

As a gun owner the security of your rifle is your responsibility. Make sure that your rifle

remains in responsible hands…yours! Don’t become involuntarily associated with it in a

crime or tragedy: make sure your rifle is properly secured. Lock it in a secure storage

container, or if none is available, remove the bolt carrier assembly and store it separately.

WARNING

When not actually shooting your rifle, to avoid accidental firing, be sure the ammunition in

the rifle is unloaded. Failure to do so could result is serious injury or death.

Be sure the cam pin is installed in the bolt group. If it isn’t, your rifle can still fire and will

explode causing injury.

Do not exchange or switch bolt assemblies from one rifle into another. It could cause

damage to both you and your rifle.

Don’t overheat your barrel. Sustained firing of the M468 will rapidly raise the temperature

of the barrel to a critical point.

Firing 140 rounds, rapidly and continuously, will raise the temperature of the barrel to

cookoff point. At this temperature, any live round remaining in the chamber for any reason

may detonate (cookoff) in as short a period as 10 seconds.

If the cookoff point is felt to be possible clear your rifle and allow it to cool.

Sustained rate of fire for the M468 rifle is 12-15 rounds per minute. This is the actual rate of

fire this rifle can continue to deliver for an indefinite length of time without overheating.

Sustained rate of fire should never be exceeded except under circumstances of extreme

urgency.

If there is water or any obstruction in the barrel, do not fire the rifle. It could explode.

If you experience a noticeable difference in sound or recoil, stop firing. Either condition

could indicate an incomplete propellant burn, and a bullet still in the bore. Retract bolt slowly

and remove fired cartridge case. Clear rifle and check for unburned powder grains in the

receiver or bore and for a bullet in the bore. Remove unburned propellant or bullet from the

bore before resuming firing or barrel could explode. If bullet is lodged in bore, take your rifle

to a qualified gunsmith.

Use only authorized ammunition manufactured to U.S. specifications.

2

Do not mistake the 6.8 round with the .223/5.56 round. Firing the wrong caliber ammunition

could result in the rifle exploding, possibly causing injury to yourself. Do not use or confuse

yourself with any 5.56 components. Do not mix 5.56 magazines, muzzle brakes, flash

hiders, sound suppressors, or blank firing attachments. Be aware that a simple mixing of

components can result in rifle damage and personal injury.

Use of improper ammunition will invalidate your warranty.

Fundamental Rules For Safe Rifle Handling

Always keep the rifle pointed in a safe direction.

Never load the gun until ready to use.

Keep your finger off the trigger until ready to shoot.

Notice

Barrett Firearms Manufacturing, Inc. (B.F.M.I.) has no control over the use of your rifle, and

shall not be responsible for injury, death, or damage to property resulting from either

intentional or accidental discharge of this firearm, or for its function when used for purposes

or subjected to treatment for which it was not intended. B.F.M.I. will not honor claims under

the warranty which result from careless or improper handling, unauthorized adjustments or

part replacement, corrosion, neglect, use of the wrong type caliber of ammunition, or the use

of ammunition that is not original, high quality commercially manufactured and in good

condition, or any combination thereof. B.F.M.I. will not honor claims under the warranty for

any reason or cause when second or subsequent owners make such claims.

ABOUT YOUR M468 RIFLE

Caliber: 6.8 mm SPC – 6.8 x 43 mm

Weight: W/30 round mag 4.37 Kg (9.62 lb) approx

Length: Rifle w/muzzle brake 35 3/8 inches

Mechanical features: Rifling (RH 1/10 twist)

Firing Characteristics: Muzzle velocity (approx) 2,650 fps

Cyclic rate of fire (approx) 750 rounds per min

Max effective rates of fire: Semi: 45 rounds per min

Auto: 90 rounds per min

Sustained rate of fire: 12/15 rounds per min

Max effective range: 600 meters (individual/point targets)

800 meters (area targets)

3

OPERATING INSTRUCTIONS

Description and Use of Operator’s Controls and Indicators

MECHANICAL CONTROLS

REAR SIGHT (1) – zeroes rifle and engages targets to 460 meters.

MUZZLE BRAKE (2) – reduces amount of recoil when rifle is fired.

EJECTION PORT COVER (3) – protects upper receiver from foreign matter when rifle is not

in use. Keep port cover closed when not in use.

CARTRIDGE MAGAZINE (4) – supplies ammunition to the rifle.

MAGAZINE CATCH BUTTON (5) – releases cartridge magazine (4) from rifle when it is

depressed.

LOWER RECEIVER AND EXTENSION ASSEMBLY (6) – provides firing control for the rifle.

FORWARD ASSIST ASSEMBLY (7) – ensures that bolt is fully forward and locked.

SHOULDER GUN STOCK ASSEMBLY (8) – stabilizes rifle and with the standard buttstock,

provides storage for basic cleaning materials.

CHARGING HANDLE ASSEMBLY (9) – cocks rifle when preparing to fire or when clearing

rifle.

FRONT SIGHT (10) – adjustable for elevation.

SELECTOR SWITCH (11) – arms the rifle (in semi or auto) or safes the rifle.

TRIGGER (12) – controls the firing of the rifle.

BOLT CATCH (13) – automatically retains carrier assembly to rear after firing last shot. Can

also be manually engaged.

BARREL ASSEMBLY (14) – directs the projectile upon firing.

4

OPERATING PROCEDURES

1. LOADING

WARNING

Point muzzle in a safe direction.

Note:

The hammer must be cocked in order for the selector switch to be placed on “SAFE”.

To cock hammer and hold bolt open; To cock and allow bolt to close;

1.Pull charging handle assembly (1) rearward,

depress bottom of bolt catch (3), and manually

return charging handle. Place selector switch

(2) on SAFE.

2. Pull charging handle assembly (1)

rearward and check to see that chamber is

clear. Release charging handle assembly.

Place selector switch (2) on SAFE.

Insert loaded magazine (3) into rifle’s magazine well until magazine catch (4) engages and

holds cartridge magazine. Tap upward to make sure cartridge magazine is seated correctly.

Note:

Magazine may be inserted with bolt assembly open or closed

5

2. CHAMBERING AND FIRING A ROUND

2.A. BOLT ASSEMBLY OPEN METHOD

2.B. BOLT ASSEMBLY CLOSED METHOD

1. Depress upper portion of bolt catch

(1) to release the bolt.

2. Tap forward assist assembly (2) to

ensure bolt is fully forward and locked.

3. Move selector switch (3) to FIRE. 4. Squeeze the trigger (4) and fire.

1. Pull the charging handle assembly (1) to

the rear, until it stops.

2. Release the charging handle assembly.

3. Never “ride” the charging handle

assembly (1). Let it go on its own.

4. Tap forward assist assembly (2) to

ensure bolt is fully forward and locked.

6

3. CLEARING YOUR RIFLE

WARNING

To avoid accidental firing, always look into chamber after clearing rifle to make sure it

does not contain a round.

5. Place the selector switch (3) on FIRE. 6. Squeeze the trigger (4) and fire.

1. Place selector switch (1) on SAFE.

Note:

If rifle is not cocked, lever cannot

be pointed toward SAFE.

2. Remove cartridge magazine (2) by

depressing magazine catch button (3) and

pulling cartridge magazine (2) down.

Note:

Ensure that the selector

switch (1) is on SAFE.

3. To lock bolt open, pull charging handle

assembly (4) rearward, press bottom of bolt

catch and allow bolt to move forward until it

engages bolt catch (5). Return charging

handle assembly (4) forward.

4. Check receiver and chamber (6) to

ensure these areas contain no ammunition

7

OPERATION UNDER UNUSUAL CONDITIONS

Note:

Unusual conditions are defined as any climatic conditions requiring special

maintenance of the rifle. Perform the maintenance of the rifle for the climate that

most applies to your operational area.

HOT, DRY CLIMATES

A. Dust and sand will get into rifle and will cause malfunctions and excessive wear on

component working surfaces through abrasive action during the firing operations.

B. Lubricate internal working surfaces with a small amount of CLP (Cleaner, Lubricant

and Preservative). Do not overly lubricate external parts of the rifle. Doing so will

only collect dust and sand, making it difficult to keep the rifle clean. Do not lubricate

internal components of the magazine.

C. The use of additional equipment, such as protective end cap and spare magazine

protective bags and overall rifle protective cover is recommended and will help keep

dust and sand from getting into the rifle.

EXTREME COLD CLIMATES

A. To prevent condensation of moisture and freezing, keep rifle covered when moving

from a warm to a cold area to allow gradual cooling. Do not lay a warm rifle directly

in snow or ice. Always attempt to keep the rifle dry. Unload and hand function the

rifle every 30 minutes to help prevent freezing of the functional parts.

B. When moving a cold rifle into to a warm place, moisture (condensation) will form in

and on your rifle. If possible, leave your rifle in a protected but cold area outside.

When the rifle is brought inside a warm place, it should be disassembled and wiped

dry several times as it reaches room temperature.

C.

Keep the insides of magazines and your ammunition wiped dry. Moisture will freeze

and cause malfunctions. Do not lubricate the ammunition. The use of the muzzle

cap, protective magazine bags, and overall rifle cover will help protect your rifle. Use

them whenever the situation permits

Note:

If rifle is to be stored, it should be dry

fired to release tension on hammer

spring.

WARNING

Be sure to clear rifle before dry fire.

5. With selector switch (1) pointing toward

SAFE, allow bolt to go forward by pressing

upper portion of bolt catch (5).

6. Place selector switch (1) on FIRE and

squeeze trigger to release tension on

hammer spring.

8

HEAVY RAIN CLIMATES

A. Clean and lubricate rifle more frequently. Inspect hidden surfaces of the bolt and

carrier assembly, upper receiver and chamber/barrel extension, and the lower

receiver and buffer tube for corrosion. Also, pay close attention to spring-loaded

detents on rifle.

B. To help prevent corrosion, remove handprints with a dry rag and lubricate lightly with

CLP. Unload and check the inside of the magazines frequently for moisture and

corrosion. Wipe ammunition dry before reloading.

C. Always keep the rifle dry.

D. Always drain any water from barrel before firing. Using the protective cap will help

keep water out of the barrel. Perform maintenance according to the appropriate

climatic condition as the situation warrants.

MAINTENANCE PROCEDURES

FIELD-STRIPPING YOUR M468

CLEARING RIFLE

HAND GUARDS

1. Only remove and clean hand guards if dirt

and corrosion can be seen through hand guard

vent holes.

2. To release hand guard, push in on spring-

loaded buttons and turn it so the slot with the

scallop is facing the opened padlock emblem.

3. The locking buttons will pop out for releasing

the hand guards.

4. After cleaning, space interlocking lugs between one another and lock into upper

receiver rail track (1) on one side.

5. Re-attach by slapping lower hand guard (2) into track and pulling rearward to locking

position.

6. To lock lower hand guard, push in spring loaded button so that two scallops on each

side of slot are in a vertical position. For additional information, see Selective Integrated

Rail installation guide.

WARNING

To avoid accidental firing, be sure

rifle is clear. Place selector switch

on SAFE. Pull back charging

handle (1) and check chamber (2).

Remove magazine.

9

SEPARATING THE

UPPER AND LOWER RECEIVERS

DISASSEMBLY OF UPPER

RECEIVER COMPONENTS

With safety on and bolt carrier closed, push

takedown pin (1) as far in as it will go

(takedown pins remain captured to lower

receiver and are not intended to be removed

from hole). Pivot upper receiver (2) from

lower receiver (3). Push receiver pivot pin

(4). Separate upper (2) and lower (3)

receivers.

1. Pull back charging handle assembly

(1) and withdraw the bolt carrier

assembly (2) from the upper receiver.

2. Remove bolt carrier assembly (2). 3. Pull and lift charging handle assembly (1)

back out of its track and remove it.

4. Remove firing pin retaining pin (4). Do not

open or close split end of firing pin retaining

pin (4).

5. Push bolt (3) into locked position.

10

Note:

Disassemble extractor and spring assembly only when dirty or damaged.

10. Use pin punch (5) to remove

extractor pin (8).

11. Remove extractor (7) and springs (9).

6. Remove firing pin (5) out of rear of bolt

carrier assembly (2).

7. Rotate bolt cam pin (6) a ¼ turn and lift it

out.

8. Remove bolt assembly (3) from bolt

carrier (2).

9. Press top of extractor (7) to check that

spring works.

11

UPPER RECEIVER AND BARREL ASSEMBLY CLEANING

Use quality commercial lubricant on the following areas:

A. All areas of powder fouling, dirt, rust, and corrosion.

B. Bore and chamber.

C. Upper receiver and barrel assembly locking lugs.

D. Gas tube.

1. Use cleaning rod, bore brush, and quality

commercial lubricant. Lightly lubricate bore and

chamber, locking lugs, outer surfaces of barrel and

front sight, and surfaces under hand guards. Run

rod through chamber and muzzle brake (3).

Note:

Do not reverse direction of bore brush while it

is in the bore.

2. Install chamber brush on cleaning

rod (1), dip in quality commercial

lubricant, and insert in chamber (2)

and locking lugs (4). Clean by

pushing and twisting cleaning rod.

DISASSEMBLY OF THE LOWER RECEIVER

Press in and hold buffer (1), then depress retainer (2) to release buffer. Carefully remove

buffer (1) with main spring (3). No further disassembly is recommended.

CAUTION

The buffer can be launched from its tube and cause injury.

REASSEMBLY is the reverse of all procedures.

12

CHARGING HANDLE ASSEMBLY AND BOLT CARRIER ASSEMBLY CLEANING

1. Clean all parts and outer surfaces of the

bolt carrier assembly (1) with a swab

saturated with quality commercial lubricant.

2. Clean the bolt carrier key (2) with a worn

bore brush dipped in lubricant. Dry with a

pipe cleaner. Use a pipe cleaner to apply a

light coating of lubricant to carrier key (2).

CAUTION

Do not use firing pin to clean inner surfaces of bolt or bolt carrier assembly.

CHARGING HANDLE ASSEMBLY AND BOLT CARRIER ASSEMBLY INSPECTION

3. Remove carbon deposits and dirt from locking lugs (3) with bore brush dipped in

quality commercial lubricant.

4. Clean areas behind bolt rings (4) and under lip of extractor (5).

WARNING

DO NOT interchange bolt

assemblies between rifles.

1. Inspect charging handle assembly

(1) for cracks, bends, or breaks.

2. Inspect bolt assembly (2) for cracks

and fractures, especially in the cam

pin hole area.

3. Inspect firing pin retaining pin (3)

for bends, dents, or breaks.

4. Inspect bolt cam pin (4) for cracks

or chips.

5. Inspect firing pin (5) for bends,

cracks, or blunted tip.

13

CHARGING HANDLE ASSEMBLY AND BOLT CARRIER ASSEMBLY LUBRICATION

1. Lightly lubricate firing pin (1) and firing pin recess (2) in bolt assembly.

2. Generously lubricate outside of bolt cam pin (3) and firing pin retaining pin (4) with

quality commercial lubricant. Make certain to lubricate bolt assembly cam pin hole (5),

bolt rings (6), and outside of the bolt assembly (7).

3. Dry inside key of bolt carrier assembly

(8). Place drop of lubricant inside key.

4. Lightly lubricate inner and outer

surfaces of bolt carrier assembly (8) with

quality commercial lubricant. Generously

lubricate slide (9) and cam pin area (10) of

bolt carrier assembly.

5. Lightly lubricate charging handle

assembly (11).

14

LUBRICATION LOWER RECEIVER AND EXTENSION ASSEMBLY

LOWER RECEIVER CLEANING

CAUTION

Do not use steel wire brush or abrasive materials to clean aluminum surfaces.

1. Wipe dirt from trigger (1) with a swab.

2. Use a swab dipped in quality commercial lubricant and cleaning brush to clean

powder fouling, corrosion, and dirt from outside parts of lower receiver and

extension assembly (2).

3. Clean buffer assembly (4), spring (5), and inside lower receiver and extension

assembly (2) with swab dipped in quality commercial lubricant. Wipe dry.

1. Lightly lubricate inside of lower receiver

and extension assembly (1), spring (2), and

buffer assembly (3) with quality commercial

lubricant.

2. Generously lubricate takedown (4) and

pivot pins (5) and inside parts of lower

receiver and extension assembly (1) with

quality commercial lubricant.

15

FUNCTIONAL CHECK

WARNING

To avoid accidental firing, be sure that the cartridge magazine is removed and the

chamber is clear.

SIGHT ADJUSTMENTS – M468 RIFLE

RIFLE SIGHTS (ZERO ADJUSTMENT)

Move front (1) and rear (2) sights to make sure they can be adjusted. Return sights to zero

setting of your rifle. The elevation adjustments of the rifle are adjusted with the front sight.

The windage adjustments of the rifle are made with the rear sight.

1. Pull charging handle assembly (1) to

rear and release. Place selector switch

(2) on SAFE. Squeeze trigger (3).

Hammer should not fall.

2. Place selector switch (2) on FIRE.

Squeeze trigger; hammer should fall. Hold

trigger to the rear. Pull charging handle

assembly (1) to rear and release. Release

trigger (3). You should hear a click as you

release the trigger. Squeeze again; hammer

should fall.

16

FRONT SIGHT

REAR SIGHT

1. The front sight (1) can be moved up or down when zeroing rear sight.

2. To increase front sight post elevation (raise point of impact of bullet), insert key (2) and

turn clockwise.

3. To decrease elevation (lower point of impact of bullet), insert key and turn

counterclockwise. Once rear sight is zeroed, front sight post (3) should not be moved.

1. The low-profile rear sight (1) can be engaged by depressing the spring-loaded flip-up

lever.

2. To change horizontal point of impact of the bullet, rotate windage knob (2) located on

the side of rear sight. This will move rear sight to left or right when zeroing.

3. Rotate windage knob (2) clockwise to move point of impact of bullet to the right.

Rotate knob counterclockwise to move point of impact of bullet to the left.

17

SUPPRESSOR – M468 RIFLE

WARNING:

The ownership of a sound suppressor must be approved by the BATFE. Go to

www.atf.gov/forms ATF F 5320.4 (Form 4) to obtain approval information.

SUPPRESSOR ATTACHMENT SUPPRESSOR DETACHMENT

To attach suppressor (1) to the rifle barrel

(2), slide sound suppressor over muzzle

and rotate clockwise until it locks in place.

CAUTION:

The temperature of the suppressor will

rapidly increase during use. Do not

burn hands or clothes.

To detach suppressor (1) from end of

M468 rifle barrel (2), depress suppressor

ratchet pawl button (3) and rotate sound

suppressor counterclockwise. Once

suppressor is off its threads, it can be

removed from the rifle.

NOTE:

Use only BMFI sound suppressors in conjunction with the M468 rifle system!

USE OF NON-BMFI SOUND SUPPRESSOR VOIDS ALL WARRANTIES!