an-pvs-10 day-night sight and m24 sws info (cont. reticle)

5/28/2018 An-pvs-10 Day-night Sight and m24 Sws Info (Cont. Reticle)

1/16

http://dc141.4shared.com/doc/pnpZpXAi/preview.html

M24 SNIPER WEAPON SYSTEM

The M24 SWS (Figure D 1) is a 7.62mm, bolt action, six round repeating rifle,with one round in the chamber and five in the magazine. This weapon has three

sights: iron sights, an M3A daysight, and an AN/PVS 10 sniper night scope(SNS).

Figure D 1. M24 Sniper Weapon System.

Components and Operation

To effectively operate the M24 SWS, the sniper must understand its

components and how they work, and he must be able to maintain andrepair them.

NOTE:See Appendix J for maintenance and repair.
http://dc141.4shared.com/doc/pnpZpXAi/preview.htmlhttp://dc141.4shared.com/doc/pnpZpXAi/preview.htmlhttp://dc141.4shared.com/doc/pnpZpXAi/preview.html


2/16

Safety Selector

The safety selector (Figure D 2) is located on the right rear side of the

receiver. When properly engaged, the safety selector, labeled "S", protectsagainst negligent discharge.

To engage the safety selector, place it in the SAFE position, marked "S".To disengage the safety selector, place it in the FIRE position, marked "F".

CAUTION

Always place the safety selector in the SAFEposition before handling, loading, or unloadingthe weapon; place the safety selector in theFIRE position only when you are ready to firethe rifle and your sights are on the target.Failure to do so can result in accidental firing of

the weapon.

Figure D 2. Safety selector.

Clearing Procedures

To clear the weapon

1. Place the safety selector in the SAFE position.

CAUTION

If the weapon will not move to the SAFE

position, perform the following steps with extracaution.

2. Lift the bolt handle fully, and pull to the rear.

NOTE: Place the safety selector in the SAFE position if unable to

in Step 1.

3. Inspect the chamber and magazine for rounds.

NOTE: If a round is in the magazine, press the floorplate latch

(Figure D-5), and the round will drop out of the magazine. Then,close the floorplate.


3/16

4. The weapon is clear.

Bolt Assembly

The bolt assembly locks the cartridge into the chamber and extracts the

cartridge from the chamber.Removing the Bolt from the Receiver

To remove the bolt from the receiver

1. Release the internal magazine.

2. Place the safety selector in the SAFE position.

3. Raise the bolt handle.

4. Pull it back until it stops.

5. Push the bolt stop release (Figure D 3).

6. Pull the bolt from the receiver.

Figure D 3. Bolt stop release.

Replacing the Bolt

To replace the bolt1. Ensure that the safety selector is in the SAFE position.

2. Align the lugs on the bolt assembly with the receiver(Figure D 4).

3. Slide the bolt all the way into the receiver.

4. Push the bolt handle down.

Figure D 4. Alignment of M24 SWS bolt.


4/16

Trigger Assembly

The trigger is adjusted at the factory for a 2.5-pound nominal trigger pull

force. Using the 1/16-inch hex key provided in the deployment kit, thesniper can adjust the pull force to any pull force between 2 and 8 pounds.

To do so, turn the adjusting screw (Figure D-5) clockwise to increase

trigger pull, and counterclockwise to decrease it.

WARNING

Never remove the trigger mechanism oradjust the trigger assembly, except asdescribed.

Figure D 5. Adjustment of M24 SWS trigger pull

Stock

The M24 SWS stock has a butt plate that adjusts for length of pull.

Adjustment

To adjust the M24 SWS stock (Figure D 6)

1. Turn the thin wheel on the stock counterclockwise(away from the thick wheel) to allow for adjustment.

2. Turn the thick wheel on the stock

Clockwise to lengthen the stock.Counterclockwise to shorten the stock.

3. Turn the thin wheel clockwise (against the thickwheel) to lock the stock in place.


5/16

Figure D 6. Adjustment of stock.

Sling

The sling binds the parts of the body used in aiming into a rigid bonebrace, enabling the sniper to hold the weapon steady without musculareffort. When properly adjusted, the sling permits part of the recoil of the

rifle to be absorbed by the nonfiring arm and hand, removing recoil fromthe firing shoulder.

The sling consists of two different lengths of leather straps joined together

by a metal D ring (Figure D-7). The longer strap is connected to the sling

swivel on the rear stud on the buttstock of the rifle. The shorter strap isattached to the sling swivel on the forearm of the rifle.

Figure D 7. Sling.

Adjustment

There are two leather loops on the long strap, known as keepers. Thekeepers are used to adjust the tension on the sling. The frogs are hooks that

are used to adjust the length of the sling.

To adjust the sling

1. Ensure that the sling is only attached to the front sling

swivel.

2. Hook the two pronged frog at one end of the long strapinto whichever pair of holes (on the same strap) causes

the metal D ring to align with the comb of the stock(Figure D 8).


6/16

Figure D 8. Adjustment of M24 SWS sling.

3. After adjusting the length of the sling, place theweapon on your firing hip and support the weapon

with your firing arm. Turn the sling 90 degrees away

from yourself. Insert your nonfiring arm into the loop,and then into the strap.

4. Slide the loop in the large section of the short sling, upyour nonfiring arm to just below the armpit (left,Figure D 9).

5. Slide both leather keepers down the sling until theybind the loop snugly around the nonfiring arm.

6. Move your nonfiring hand inside the sling, betweenthe sling and the rifle. With the same hand, grasp the

weapon just behind the front sling swivel, and forcethe weapon out and away from yourself (right, Figure

D 9).

7. With your firing hand, pull the butt of the weapon intothe pocket of your shoulder. Grasp the weapon at the

small of the stock, and begin the aiming process.

Figure D 9. Proper placement of the sling.

M3A Scope

The M3A scope enables the sniper to see a magnified image of the targetand the crosshairs of the weapon with identical sharpness, which helps the


7/16

sniper identify and engage the target. The lenses of the scope are coated

with a thin material that reduces reflection.

Mounting

The M3A scope mount (Figure D 10) has a baseplate with four screws, apair of scope rings, and two mounting ring nuts.

Figure D 10. M3A scope.

To mount M3A scope

NOTE:The iron sights are removed for scope use.

1. Mount the baseplate by screwing the four baseplatescrews through it and into the top of the receiver. The

screws must not protrude into the receiver andinterrupt the functioning of the bolt.

2. Mount the scope rings. Each pair of scope rings has anupper and a lower ring half and four screws. The M3A

scope has two sets of mounting slots. Pick the set that

gives you the best eye relief.

NOTE: Adjust the eye relief until you can see the full field of

view. The average distance is 3 to 3 1/2 inches. Once you have

chosen a set of slots, use the same set again in the future to

maintain the zero.

3. Lubricate the threads of each mounting ring nut.

4. Ensure that each mounting ring nut and claw movessmoothly.

5. Remove any burrs or foreign matter from the ring nutsand claws.

6. Mount the sight and rings to the base.

7. Ensure that the mounting surface is free of dirt, oil, or

grease.8. Set each ringbolt spine into the selected mounting slot.


8/16

9. Slide the rear mount claw against the base, andfinger tighten the mounting ring nut.

NOTE:If the scope needs adjustment, loosen each mounting ringnut, and align the ringbolts with the other set of slots on the base.

Repeat Steps 8 and 9.

10.Slide the front mount claw against the base, andfinger tighten the mounting ring nut.

11.Use the T handled torque wrench, which is preset to 65inch pounds, to tighten the front and rear mounting

ring nuts.

Adjustment

The scope adjustment dials are under the adjustment dust cover. Aftermounting the M3A scope, the sniper can adjust for elevation, windage, and

focus (Figure D-11). He can also adjust the eyepiece (Figure D-12).

Figure D 11. Adjustment of focus, elevation, and windage.

Elevation

The elevation adjustment dial is located on top of the scope barrel. The dialis indexed from 1 to 10. Each click of the elevation dial equals 1 MOA,

and each numbered index mark represents 100 meters.

Windage

The windage adjustment dial is located on the right side of the scope

barrel. Turning the dial in the indicated direction moves the point ofimpact in that direction. Each click on the windage dial equals 1/2 MOA.

Focus

The focus adjustment dial is located on the left side of the scope barrel.The dial has limiting stops. To adjust the focus adjustment dial


9/16

For a close target, rotate the dial to the largest dot, and focus out from

there.

For a distant target, rotate the dial to the infinity symbol (), andfocus in from there.

Eyepiece

To focus the eyepiece (Figure D-12)

1. Grasp the eyepiece, and back it away from the lockring.

NOTE: The lock ring loosens automatically, so you need no tools.

2. Turn the eyepiece several turns to move it at least 1/8inch. This is the smallest change that will affect the

focus.3. Look through the scope at the sky or a blank wall to

ensure that the reticle looks sharp.

4. Lock the lock ring.

Figure D 12. Adjustment of eyepiece.

Mil-Dot Technique of Range Determination

When using the M3A scope, the sniper uses the mil dots on the reticle todetermine the range to the target. The lines in the duplex style, mil-dot

reticle (Figure D 13) have thick sections near the outside of the ring and

thin sections on the inside. Superimposed on the thin center of each radia isa series of dots, four to each side of the center of the reticle and four above

and below the center. These dots divide the four radia into six equalsections, 1 mil apart, and 1 mil from the center and the start of the thick

portion of the reticle. This lets the sniper closely estimate target range,

assuming that he sees an object of known size (height or width) in the fieldof view. For example, at 500 meters, a 6-foot human target is 3.65 mils.


10/16

Figure D 13. Mil-dot reticle.

Zero

The sniper zeroes the M3A scope on a known distance range (preferably900 meters long) with 200 yard bullseye targets (NSN

SR16920 00 900 8204). To zero the M3A scope

1. Assume a good, prone supported position 100 metersfrom the target.

2. Ensure that the "1" on the elevation dial aligns with theelevation index line, and that the "0" on the windage

dial aligns with the windage index line.

3. Fire three rounds at the center of the target, keepingthe same aiming point each time.

4. After noting the strike of the third round, triangulatethe result.

5. Turn the elevation and windage dials to bring the pointof aim to the point of impact.

Each click on the elevation dial equals 1 MOA. At 100 meters, 1

MOA equals about 1 inch.

Each click on the windage dial equals 1/2 MOA. At 100 meters,1/2 MOA equals about 1/2 inch.

6. Once you center a shot group, loosen the hex headscrews on the elevation and windage dials. If needed,turn the elevation dial to index line "1" and the

windage dial to index line "0," and then tighten the hexhead screws.


11/16

NOTE:After zeroing at 100 meters and calibrating the dial,confirm the zero by firing and recording sight settings through 900

meters, at 100 meter increments.

Field Expedient Confirmation of ZeroCircumstances, such as dropping a weapon or extreme climatic changescan force the sniper to confirm zero in the field. There are two field-

expedient methods to confirm zero:

25 yard or 900 inch method.

Observation of impact method.

25 Yard or 900 Inch Method

To perform the 25 yard or 900 inch method

1. Dial the scope to 300 meters for elevation and 0 forwindage.

2. Aim and fire at a target at a distance of 25 yards.

3. Adjust the scope until rounds impact 5/8 of an inchabove the point of aim.

4. To confirm, set elevation to 500 meters. The roundsshould impact 1/4 inches above the point of aim.

Observation of Impact Method

When a known distance range is unavailable, the sniper should perform theobservation of impact method. To perform this method

1. Locate a target where the observer can see the impactof rounds clearly.

2. Determine the exact range to the target.

3. Dial in the appropriate range, and fire.

4. Watch the impact of the round; the observer givessight adjustments until round hits the point of aim.

Removal

He can easily remove and replace the scope with less than 1/2 MOA

change in zero. However, he should try to leave it on the rifle.

Storage

The M3A scope is a delicate instrument that must be handled with care.Dirt, rough handling, or abuse of any optical equipment can affect

accuracy and function. To properly store the M3A scope, consider the

following:

When not in use, place the scope in its case, with all lenses capped.


12/16

Keep the lenses free of oil and grease. Avoid touching the lenses with

your fingers, because body oil and perspiration can damage them.To remove oil or grease, apply a drop of lens cleaning fluid or

rubbing alcohol on a lens tissue. Use a circular motion to wipe

each lens carefully, beginning at the center, and moving outward.Dry the lenses using a clean lens tissue. If you lack these supplies,

breathe heavily on the glass and wipe it with a soft, clean cloth.

When removing dust and other foreign matter, carefully brush the

lenses with a clean camel hair brush.

Check and tighten all mounting screws periodically, and alwaysbefore an operation.

Do not disturb the coarse windage adjustment.

Do not force the elevation and windage screws or knobs.

Keep the scope covered when not in use. The lenses will magnify andconcentrate sunlight into a pinpoint of intense heat, which wouldfall on the mil scale reticle. This could melt the mil dots and

damage the scope internally.

Avoid dropping the scope or striking it with another object. Not onlycould this affect the zero, it could also permanently damage the

scope.

In moderate temperatures, remove condensation by placing the sightin a warm place. Avoid the application of concentrated heat,

because it can expand and damage the sight. Blot any moisture

from the optics with a lens tissue or a soft, dry cloth.

Thoroughly clean, dry, and lightly oil the scope after use, because

perspiration is salty and can cause rust.

Further, different climates require different procedures for maintainingoptical equipment:

In extreme cold

Avoid letting water condense or oil congeal on the sight. In cold

temperatures, oil thickens and causes sluggish operation orfailure. Focusing parts are vulnerable to oil seepage and their

function would be greatly affected if those oils froze.

Breathing produces frost, which can accumulate on the sight. Cleanit off with lens tissues preferably dampened lightly with

alcohol.

In hot, humid temperatures

Keep the caps on the scope when not using it.

If moisture or fungus develops on the inside of the scope, replace

the scope.In desert conditions, protect the scope from direct sunlight.


13/16

When operating in salt water conditions

Protect the scope from direct sunlight.

Inspect, clean, and lightly oil the scope regularly to prevent rustand corrosion.

AN/PVS 10 sniper night scope

The AN/PVS 10 sniper night scope (SNS) is an integrated daysight andnightsight for the M24 SWS. This scope magnifies the image of the target

to improve the sniper's aim. The fixed mount, mounting clamps, and nutsallow the sniper to detach and reattach the scope easily, while maintaining

accuracy of the scope. The main components of this AN/PVS 10 SNSinclude the objective lens assembly, relay optics for both day and nightviewing channels, and an eyepiece assembly.

NOTE: An identification plate on the bottom of the scope givesthe serial number and other information needed for maintenanceand hand receipt purposes. The 3 inch (76 mm) eye relief protects

the eye from recoil injury.

Figure D 14 shows the following components of the AN/PVS 10 SNS:

1. Battery CapThe battery cap attaches to thehousing with a thumbscrew. It seals to keep the

battery compartment waterproof.

2. Carrying CaseThe carrying case transportsand protects the scope and accessories.

3. Technical ManualTM 11 5855 303 12&Pprovides unit maintenance instructions.

4. Light Interference FilterThe light interferencefilter (LIF) has a filter cell, filter, retainer, andO ring. It protects the sniper from eye injury and

the image intensifier tube from battlefield lasers.

It is installed in front of the objective lens.

5. Objective Lens CapThis cap protects theobjective lens and acts as a sunshade when thelens cap is in the open position. A 1/8 inch

pinhole in the center of the cap lets the sniper

operate the night channel of the scope indaylight.

6. BatteriesThe AN/PVS 10 SNS operates oneither two AA alkaline batteries or two 1.5 voltAA lithium batteries. The sniper should save thelithium batteries for extremely cold conditions,

when the alkaline batteries will fail to function.


14/16

7. Lens PaperThe sniper uses lens paper to cleanthe lens surfaces.

8. Shipping and Storage CaseThe shipping andstorage case protects the AN/PVS 10 SNS. It

has upper and lower inserts and a nameplate.9. Light Interference Filter BagThe LIF bag

protects the filter when not in use.

10. O-RingsThese rings, located below the dialdust covers, protect the dial from moisture.

11. Dial Dust CoversThese covers protect thewindage and elevation dials.

12. EyeguardThe eyeguard has a molded rubbereyecup and an adapter ring. It protects the eye

from recoil, keeps the image intensifier tubefrom illuminating the sniper's face, and protectsthe eyepiece optics.

13. Protective CapThis cap protects the eyepiecelens in the case and when the eyeguard is notused.

14. SunshadeThis shade reduces the reflection ofthe sun off the objective lens.

Not depicted is the cutoff sensor. The cutoff sensor points upward from the

top of the housing. This sensor conserves battery life and protects the tubefrom damage in case the scope is left in NIGHT mode in daylight. When it

senses light levels greater than 4 foot-candles for more than 70 seconds, it

shuts off automatically and stays off until the sniper presses the TUBEON/OFF switch.


15/16

Figure D 14. AN/PVS 10 sniper night scope.

The lines in the duplex style, mil dot reticle (Figure D 15) each have athick section near the outside of the ring and a thinner section near thecenter. An etched glass reticle is located on an image plane shared by the

eyepiece and the two relays. In NIGHT mode, the reticle is illuminated,and the objective lens assembly focuses incoming light on the

image intensifier tube. In DAY mode, the movable mirror remains up infront of the image tube. This feature protects the image tube from exposure

to direct sunlight. In NIGHT mode, the mirror remains down and away

from the day mode optical path, preventing reticle illumination fromprojecting back through the objective lens. The image tube has automaticbrightness control and manual gain control. The day night relays send the

image to the reticle.


16/16

Figure D 15. Reticle and location of low battery indicator.

an-pvs-10 day-night sight and m24 sws info (cont. reticle)

Documents

bolt handle

bolt assemblythe bolt

alignment of m24 sws

bolt action

release figure d

m24 sws info

safe position

receiverfigure d