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Posted: 11/12/2008 9:07:42 AM EDT
| I have a colt 6920 and am confused about sighting in. I have read the sticky here concerning this but am confused. It talks about 8/3. My rifle does not have this it has 6/3 and a z which I assume is for zero. However the z seems to not line up exactly with the line. ( maybe close enough) From what I have read I dont think I like the 25m zero and would like something where I am closer to zero at 100 yds. I also read the 50 yard zero thread which sounds better but the part about altering the elevation adjustment with an allen wrench is confusing. Any help would be appreciated. |
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25 METER ZEROING PROCEDURE
ADJUSTABLE REAR SIGHT - Two apertures for range SHORT RANGE OR AT NIGHT -This “larger aperture is used for 0-200 meters range. As shown, the sight is set for 0-200 meters. This larger aperture is only used when the rear sight is all the way down. In other words, the 300-meter mark is aligned with the mark on the left side of the receiver. Useful for moving targets. NORMAL RANGE -The aperture is unmarked and used for most firing situations. It is used in conjunction with the elevation knob for 300, 400, 500, 600, 700, and 800-meter targets. BATTLESIGHT ZERO When battlesights are on your weapon: a The front sight past and rear sight windage knob are adjusted so you can hit your point of aim at 300 meters. b. The unmarked aperture must be in the up position. c. The 300-meter mark is aligned with the mark on the left side of the receiver. This will read 8/3 for the M16A2/M16A3 and 6/3 for the M4/M4A1/M16A4. BATTLESIGHT ZEROING ADJUSTMENTS 1. During zeroing procedures, only the front sight post and windage knob are adjusted to move the strike of the bullet on the target. 2. If you are zeroing on a 25-meter range, the rear sight elevation knob is adjusted in accordance to whichever weapon you are using. 3. Detailed zeroing procedures are on the target and the following pages. FRONT SIGHT - The front sight post is moved up or down when zeroing the weapon. Once the weapon is zeroed, the front sight post should not be moved. To adjust elevation, depress detent and rotate post. To raise strike of bullet, rotate post in the direction of arrow marked UP. Reverse the direction of rotation to lower strike of bullet. Each graduation (notch) moves the point of impact of bullet as indicated. FOR ELEVATION (per click) IMPACT DISTANCE 0.9 cm (3/8 in.) 25 meters (M16A2/M16A3/M16A4) 3.5 cm (1 3/8 in.) 100 meters (M16A2/M16A3/M16A4) 7.0 cm (2 ¾ in.) 200 meters (M16A2/M16A3/M16A4) FOR WlNDAGE KNOB (per click) IMPACT DISTANCE 0.3 cm (1/8 in.) 25 meters (M16A2/M16A3M16A4) 1.25 cm (1/2 in.) 100 meters (M16A2/M16A3/M16A4) 2.60 cm (1 in.) 200 meters (M16A2/M16A3/M16A4) 3.8 cm (1 ½ in.) 300 meters (M16A2/M16A3/M16A4) 5.0 cm (2 in.) 400 meters (M16A2/M16A3/M16A4) 6.3 cm (2 Min.) 500 meters (M16A2/M16A3/M16A4) 7.8 cm (3 in.) 600 meters (M16A2/M16A3/M16A4) 8.8 cm (3 ½ in.) 700 meters (M16A2/M16A3/M16A4) 10.0 cm (4 in.) 800 meters (M16A2/M16A3/M16A4) FOR ELEVATION (per click) IMPACT 1.2 cm (1/2 in.) 4.8 cm (1 7/8 in.) 9.6 cm (3 ¾ in.) FOR WlNDAGE KNOB (per click) IMPACT 0.5 cm (3/16 in.) 1.9 cm (3/4 in.) 4.8 cm (1 ½ in.) 5.7 cm (2 1/4 in.) 7.6 cm (3 in.) 9.5 cm (3 3/4 in.) 11.4 cm (4 1/2 in.) DISTANCE 25 meters (M4/MA1) 100 meters (M4/M4A1) 200 meters (M4/M4A1) DISTANCE 25 meters (M4/M4A1) 100 meters (M4/MA1) 200 meters (M4/M4A1) 300 meters (M4/M4A1) 400 meters (M4/M4A1) 500 meters (M4/M4A1) 600 meters (M4/M4A1) BATTLESIGHT ZEROING ADJUSTMENTS (Cont) To remember your correct battlesight zero windage, note location of windage scale and windage knob pointer (heavy mark on outside of knob). Do not center rear sight aperture for inspections. Keep your correct bat&sight zero windage on your weapon at all times. By following the steps below and establishing a zero at 25 meters, your sights will be set with a 300-meter battlesight. NOTE Do not move front sight post at this time. lt was set at the factory or by a previous shooter and should be very close to your zero. Center the rear sight aperture by turning the windage knob left or right. (This is called mechanical zero windage.) 1. Position a 25 Meter Zero Target; NSN 6920-01-395-2949, 25 meters from the firing line. The rifle target is on one side and the carbine target on the other. 2. The unmarked long range aperture should be up. 3. Rotate elevation knob in the down direction (counter-clockwise). The elevation knob should stop on the 300-meter mark (8/3) M16A2/M16A3 rifles and (6/3) M16A4/M4/M4A. The rear sight should be all the way down on the last whole "click" before it bottoms out. This is called mechanical zero elevation for the rear sight If your range scale will not line up in the above manner, an armor will be required to adjust the range scale for you. 4. Now rotate the elevation knob clockwise (up) one click past the 300 meter setting for the M16A2/M16A3 rifle, clockwise (up) two clicks for the M16A4 rifle. The elevation knob should remain aligned on the 300 meter setting for the M4/M4A1 carbine. Any further corrections required in elevation are made to the front sight post only. 5. Aim at target center. Adjust front sight and rear windage to move shot group center as close as possible to the while dot in the center of target. 6. If your shot group is not in the center of the bull’s eye, use the squares on the target sheet to calculate the required "clicks" necessary to move your next shot group into the bull’s-eye. (Remember that any changes in elevation are made by moving the front sight post.) The squares are numbered around the edges of the target to equal the number of clicks required to move the shot group to the bull's eye. 7. In order to raise your next shot group, rotate the front sight post clockwise. (One click will move the strike of the bullet one vertical square on the target sheet) In order to lower your next shot group, rotate the front sight post counterclockwise (one click, as above, equals one square). Changes in windage are made with the windage knob. (Three clicks will move the strike of the bullet one horizontal square on the target sheet). In order to move the shot group to the left, turn the windage knob counterclockwise. In order to move the shot group to the right, turn the windage knob clockwise. 8. Carefully aim and fire another group at the center of the target bull’s eye. 9. Repeat Steps 6 through 8, if required 10. If your group is centered, your weapon is now zeroed. 
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