Zero Your Red Dot (50/200)

A 50-yard zero for 5.56 crosses the line of sight at 50 yards, peaks about two inches high near 125 yards, and returns to zero around 200 yards. From zero to 250 yards, your point of impact is within three inches of point of aim — good enough for any practical use of a carbine and well inside the body of any hostile target.

A 100-yard zero is mathematically clean but gives you a deeper mid-range dip and does nothing for closer fights. A 25-yard zero gets you on paper but diverges badly after 75 yards. 50/200 is the best single-zero answer for a general-purpose rifle.

Confirm your optic is torqued to spec. A loose mount is the most common cause of wandering zero. Blue Loctite on the mount screws, 30 in-lbs on Picatinny clamps (check your manufacturer spec — some differ).

Check your ammo. You zero with the ammunition you will actually fight or compete with. Zeroing with 55gr and fighting with 77gr puts your impact several inches off at 200 yards. Same lot, same weight, same powder charge.

Use a stable rest. Sandbags at 50, bench, or a prone position off a bipod. If you cannot hold a 2 MOA group, you cannot tell whether the scope or you is off.

Put a 1-inch dot or bullseye on a clean target at 50 yards measured, not estimated. Cold bore. Three rounds, slow, same hold, same trigger press each time. Mark the group centroid — not the middle of a flyer.

Math the adjustment. Most red dots are 1 MOA per click, which at 50 yards equals 0.5 inches. If the group is 2 inches low and 1 inch right at 50 yards, you need 4 clicks up and 2 clicks left. (At 25 yards, halve those values; at 100 yards, double them.)

Turn the turrets. Do not guess direction — read the arrows on the turret. Most turrets go up-and-left for clockwise. Walk back 5 yards, reacquire, and fire three more.

Repeat until your group centroid is on the dot. Do not chase single shots. Never adjust based on one round. You are looking at group centers, not flyers.

Shoot a 5-round group at 50 once you think you are on. If the group is inside 2 MOA and centered, you are zeroed. Step back to 100 yards, expect the impact 1–1.5 inches high, and confirm with a 3-round group.

Go to 200 yards if the range allows. Your point of impact should return to point of aim within an inch. If it does not, your muzzle velocity differs from the ballistic model assumed — check ammo and try again.

Record the date, ammo lot, temperature, and final click position on your logbook or phone. Every time you re-zero or swap ammo, log it. A year from now you will want to know whether your 77gr zero was 4 clicks right or left of your 55gr zero.

Torque check after every 500 rounds and before any serious use. Zero shifts happen and the fix is always simple if you catch it before it matters.