Warning

• Make sure the weapon is CLEAR and on SAFE before using the bore light.

• When rotating the bore light to zero it, ensure the mandrel turns. Do not tighten the bore light down on the mandrel; doing so could strip or break the mandrel's stud.

M16A2

M4/MWS

M249

M240B/M60

M2

M203

AT4

AN/PAQ-4C

X

X

X

X

X

X

AN/PEQ-2A

X

X

X

X

X

X

X

AN/PAS-13

X

X

X

X

X

X

M68 CCO

X

X

AN/PVS-4

X

X

X

X

X

AN/TVS-5

X

Table G-2. Possible weapon-aided vision-device combinations.

G-10. BORESIGHTING PROCESS

Properly boresighting a weapon requires two gunners--a firer and a target-holder.

a. Personnel.

(1) Firer. The firer zeroes the bore light and adjusts the aided vision device. Before boresighting, he locks the M2 down in a cradle or some other device to keep the weapon stable during the boresighting process. In the absence of such a device, he assumes the most stable supported firing position possible and makes sure the weapon does not cant during boresighting.

(2) Target holder. The target holder keeps the target straight up and down at the appropriate distance from the firer and directs the firer in making necessary sight adjustments. The target holder must wear night vision goggles when viewing laser aiming light offsets.

(1) Align Bore Light. Checking the alignment of the bore light requires the following actions:

(a) Place the appropriate mandrel, with bore light attached, in the muzzle of the weapon.

(b) Turn the bore light on so that the laser beam strikes the target (offset) 10 meters away.

(c) Slowly rotate the bore light one-half turn (180 degrees) while watching the beam on the target area, noting any circular patterns made.

(d) If the beam remains stationary, you have boresighted the M2. Move forward to the next paragraph and use the appropriate boresight target for the given weapon.

(e) If the beam rotates in a circle, adjust the windage, elevation, or both, until the beam remains stationary or rotates on itself no more than 1 centimeter.

(2) Adjust Bore Light. If necessary, the firer and target holder must adjust the bore light.

(a) Move the target 2 meters away.

(b) Mark the location of the laser beam.

(c) Slowly rotate the bore light one-half turn.

(d) Note the new location of the laser beam.

(e) Adjust the windage and elevation until the laser beam moves halfway back to its original location.

(3) Adjust elevation adjustment screw. One click at 25 meters equals 4 millimeters; clockwise equals down.

(4) Adjust windage adjustment screw. One click at 25 meters equals 4 millimeters; clockwise equals left.

(5) Continue adjusting the bore light. Keep adjusting it until the laser beam either stops moving or spins upon itself within 1 centimeter.

(6) Move the target, and recheck the boresight. Move it 10 meters away and recheck the boresight. Repeat this process every 10 meters if necessary.

NOTE: Because the M2 requires such a large offset, place the offset for the boresight target 5 meters away.

(7) Boresight the Aided Vision Device to the Weapon. Select the boresight target offset for the appropriate aided vision device. For laser aiming lights, position the weapon so the bore light strikes the black dot on the boresight target.

(a) Adjust the laser until it centers on the cross on the boresight target offset. For aided vision optics, position the weapon so the reticle centers on the cross on the boresight target offset (the firer must physically aim the weapon).

(b) Adjust the aided vision optic until the bore light strikes the black dot on the boresight target. Refer to specific instructions on each boresight-offset target.

(c) You have boresighted the weapon when both the laser bore light and the aiming point or laser move to the appropriate position on the boresight target offset.

G-11. TARGET OFFSETS

Figure G-12 (page G-23), Figure G-13 (page G-24), and Figure G-14 (page G-25) show example boresight target offsets. The gunner measures boresight offsets in 1-centimeter squares. For targets, he copies M16A2 25-meter zero targets, with the silhouette representing the point of aim.

a. Aligning the M2 with the AN/PEQ-2A. Using the 10-meter boresight target, align the bore light on the dot and adjust the AN/PEQ-2A to the cross. This gives an 800-meter zero (Figure G-12, page G-23).

b. Aligning the M2 with the AN/TVS-5. Using the 10-meter boresight target, place the target at a distance of 10 meters. Aim the 400-meter AN/TVS-5 reticle at the cross and adjust the sight so that the bore light strikes the dot (Figure G-13, page G-24).

c. Aligning the M2 with the AN/PAS-13. Using the 10-meter boresight target, place the tips of the index fingers on the gray circles. Aim between the hot spots provided by the fingers. Adjust the TWS so that the bore light strikes the dot when you aim between the hot spots at 10 meters. If using a spacer, increase the offset by the height of the spacer (Figure G-14, page G-25).

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