If I zero my carry handle sights at 100 yards with the rear sight wheel turned all the way down,(6/3) are the normal rear sight elevation settings still good for anything at all? How do you calculate sight settings for a 55 gr. projectile using a 100 yard zero? Has anyone tried it?
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Sight adjustment on AR
- Thread starter Riphalman
- Start date
This is the improved version of the Marine Corp. method published by a Lt. Colonel Chuck Santose: http://www.m4carbine.net/showthread.php?t=22
I set up for this and hot damn, almost right on. I came in about 1" high at 200 yards after zero with this procedure.
I set up for this and hot damn, almost right on. I came in about 1" high at 200 yards after zero with this procedure.
huntershooter
Inactive
Setting up M16/AR15 iron sights
Take your cleared rifle and bottom out the rear sight with the 6/3 (or 8/3) visible on the port side. Viewing from above, find the hole in front of the rear peep and loosen the screw inside with a hex wrench. This allows you to raise the rear sight and independent of the BDC stamped on the dial.
For M16A2-type rifles each click is 1 MOA. Detachable carry handles on M16A4-type rifles yield 0.5 MOA per click. This works out to about 0.75 MOA for carbine lengths (M4) depending on the exact sight radius.
Raise the rear sight 4 MOA (4 clicks for a M16A2, 8 clicks M16A4), reset the BDC to 8/3 or 6/3 and re-tighten the screw in front of the rear peep.
In this bottom position, the 8/3 or 6/3 setting indicates a 300 meter (or yard) elevation zero. Click down 3 MOA and zero at 100, adjusting the front sight for elevation correction. This yields a 100 yard/meter zero (obviously) and the BDC setting will still be correct.
Take your cleared rifle and bottom out the rear sight with the 6/3 (or 8/3) visible on the port side. Viewing from above, find the hole in front of the rear peep and loosen the screw inside with a hex wrench. This allows you to raise the rear sight and independent of the BDC stamped on the dial.
For M16A2-type rifles each click is 1 MOA. Detachable carry handles on M16A4-type rifles yield 0.5 MOA per click. This works out to about 0.75 MOA for carbine lengths (M4) depending on the exact sight radius.
Raise the rear sight 4 MOA (4 clicks for a M16A2, 8 clicks M16A4), reset the BDC to 8/3 or 6/3 and re-tighten the screw in front of the rear peep.
In this bottom position, the 8/3 or 6/3 setting indicates a 300 meter (or yard) elevation zero. Click down 3 MOA and zero at 100, adjusting the front sight for elevation correction. This yields a 100 yard/meter zero (obviously) and the BDC setting will still be correct.
huntershooter
Inactive
LTC Santose zero
LTC Santose is advising a 200 meter BZO as more optimum than the normally-prescribed 300 meters. He certainly makes good points.
If you agree with this, set your sights as described above. A 200 meter elevation zero is about 2 MOA below a 300 meter setting. If you zero as the Army and USMC directs (300 meter BZO) click down 2MOA from there and you have a Santose-approved 200 BZO. The BDC will still be correct for other distances.
LTC Santose is advising a 200 meter BZO as more optimum than the normally-prescribed 300 meters. He certainly makes good points.
If you agree with this, set your sights as described above. A 200 meter elevation zero is about 2 MOA below a 300 meter setting. If you zero as the Army and USMC directs (300 meter BZO) click down 2MOA from there and you have a Santose-approved 200 BZO. The BDC will still be correct for other distances.