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25-Meter Zeroing Procedures
(By following the steps below and establishing a zero at 25 meters, your M16A2 rifle sights will be set with a 300-Meter Battlesight.)
1. Do not move Front Sight post at this time. It was set at the factory or by a previous shooter and should be very close to your zero.
2. Center the Rear sight aperture by turning the windage knob left or right. (This is called Mechanical Zero Windage.)
3. The Unmarked aperture should be up.
4. Rotate elevation knob in the Down direction (counter-clockwise). The Elevation Knob should stop Three Clicks past the 300-Meter mark (NOTE: newer rifles may be set like this do not worry about it). 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 armorer will be required to adjust the range scale for you. (NOTE: Again this really is not required - some rifles bottom out on the 3/8 [or 3/6 for carry handles]. If you really want to adjust it then see the note at the end of these instructions.)
5. Now rotate the Elevation Knob "Up" once click past the 300-Meter mark. From this point on, the rear sight elevation knob should not be moved. Any changes in elevation required in the following zeroing steps are made to the Front Sight Post ONLY.
6. Carefully aim and fire at the center of the target bull's-eye. Take your time and be sure to use the sight picture illustrated (in the Operator's Manual).
7. If your shot group is not in the Center of the bulls-eye, use the squares on the target sheet to calculate the required "Clicks" necessary to move you next shot group (Squares are 3/8" x 3/8") into the bulls-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 (see the Operators Manual for an illustration of the Target) to equal the number of clicks required to move the shot group to the bull's-eye.
Barrel Length Change Per Click
20" 3/8" for Elevation
20" 1/8" for Windage
14.5"/16" 1/2" for Elevation
14.5"/16" 3/16" for Windage
8. 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 [20" rifle with A2 sights] - or consult the table in step 7).
In order to Lower your next shot group, rotate the front sight post counter-clockwise (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 counter-clockwise.
In order to move the shot group to the Right, turn the windage knob clockwise.
9. Carefully aim and fire another group at the center of the target bulls-eye.
10. Repeat steps 7 through 9, if required.
11. If your group is on target, your sight is now "Calibrated". To place your actual 300-Meter zero on the Rifle, you must rotate the elevation knob on click "Down". (The range scale's 300-Meter mark should now be aligned with the mark on the receiver.)
NOTE: If your rifle bottoms out at 8/3 then follow these instructions to get the sight to bottom out at 8/3 –2 clicks.
1. Flip the rear sight back to the unmarked aperture. This will reveal a hole in the top of the handle.
2. Rotate the sight wheel all the way down. Will probably be exactly at 8/3 (6/3). Don’t force it down.
3. Using a 1/16" Allen wrench loosen the screw (under the revealed hole) in the sight wheel 3 full turns. Leave the wrench in the screw.
4. Rotate the bottom half of the sight wheel two clicks clockwise. This will raise the sight body if you look at it while you’re turning it.
5. Tighten the Allen screw, remove the wrench, and confirm the sight bottoms out at 2 clicks BELOW 8/3. If not repeat the procedure until it’s right.
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