How to Adjust a Truglo Red Dot to Center Your Shots

Find the Elevation and Windage Dials on Your Sight Body

Every Truglo red dot uses two separate controls to steer where your shots land. One control handles vertical movement, and the other handles horizontal movement. Finding them depends on whether you have an enclosed tube sight or an open-window sight.

Enclosed tube sights look like small, shortened rifle scopes. On these models, you will find the elevation dial, which controls up-and-down adjustment, sitting squarely on top of the main body tube. The windage dial, which controls left-to-right adjustment, sits on the right side of the housing. Both dials are shielded beneath metal or plastic protective caps. Unscrew these caps by turning them counterclockwise by hand. Underneath, you will see a small dial with a center slot designed for a coin, a flathead screwdriver, or your fingertips.

Open-window reflex sights look like a flat metal base with a single upright pane of glass. These compact optics do not use screw-off caps. Instead, you will see small, recessed adjustment screws directly exposed on the body. The up-and-down elevation screw sits on top of the frame just behind the lens. The left-to-right windage screw sits on the right-hand side of the frame. These adjustment points usually accept a tiny hex wrench or a jeweler-style flathead screwdriver included in the original packaging.

Before you touch any dials, take a close look at the markings stamped into the metal around each screw. You will see an arrow paired with a letter, such as an arrow pointing toward "UP" or an arrow pointing toward "R" for right. These stamped arrows show you which way the point of impact shifts when you turn the dial in that direction. Knowing where these markings are makes sighting in much smoother once you get to the shooting bench.

Loosen the Rear Locking Screws Before Turning Any Dials

Forcing an adjustment dial on a red dot can permanently destroy the delicate internal gears. While standard enclosed tube sights allow you to turn the turrets immediately after removing the dust caps, many open-window red dot sights feature mechanical lock screws. If your optic has lock screws and you skip this step, you will strip the adjustment threads and ruin the sight.

Lock screws are common on open-frame models because they clamp the internal LED emitter tray securely in place. This clamping action keeps the dot from shifting under harsh recoil from shotguns or heavy-caliber handguns. When locked down, the elevation and windage screws are mechanically frozen.

Use this quick checklist to inspect and unlock your optic before turning any dials:

• Check the rear of the optic housing: Look at the flat surface directly below the back of the viewing window, facing the shooter. If you see one or two tiny set screws sitting side by side, your sight uses an adjustment lock.
• Select the correct hex wrench: Locate the smallest hex wrench that came with your optic. Never use an ill-fitting tool or force a standard size into a metric socket, or you risk stripping the screw head.
• Loosen the lock screws slightly: Insert the hex wrench and turn both rear screws counterclockwise about one half turn. You do not need to remove these screws completely. Loosening them just enough frees the internal mechanism so the adjustment dials can turn freely without resistance.
• Check dial movement: Place your tool gently into the top elevation screw and turn it slightly. It should turn with a smooth, distinct click. If you feel hard resistance, stop immediately and loosen the rear lock screws a tiny bit more.

Sight In Your Optic Step by Step at the Range

Zeroing simply means adjusting the dot so your shots land exactly where the dot points at a set distance. To get this done quickly without wasting ammunition, you need a stable shooting platform and a methodical routine. Before handling your equipment, always follow basic safety rules: point the firearm in a safe direction, remove the magazine, and verify that the chamber is completely empty. For crossbows, make sure the bow is decocked and unloaded during mounting checks.

Make sure the optic is firmly anchored to your standard Picatinny or 20mm slotted accessory rail before you fire a single shot. Tighten the mounting screws using an inch-pound torque tool according to the manufacturer guidelines, and consider adding a drop of removable thread-locking fluid. Loose mounts cause erratic shot groups that make dialing in the sight completely impossible. If you are setting up backup iron sights on a rifle, you might also look into how to line up your iron sights through the optic glass, known as cowitnessing iron sights with a red dot, to establish a quick visual baseline.

Once your mount is locked down, follow these numbered steps to align your red dot:

1. Establish a stable rest: Place your firearm or crossbow on sturdy sandbags, a shooting sled, or a bipod resting on a firm bench. Do not attempt to zero your optic while standing or shooting offhand. Any muscle twitch or body wobble will throw your shots off and confuse your adjustments.
2. Start at close range: Place a large target paper at a short distance, such as 10 to 15 yards. Starting close guarantees your first shots will actually hit paper, saving you the frustration of hunting for stray bullet holes. If you are mounting on a rimfire handgun, like when setting up a red dot sight for a Ruger Mark pistol, 15 yards is often an ideal distance to begin.
3. Fire a 3-shot group: Center your illuminated dot directly on the bullseye of the target. Keep the dot steady, take a smooth breath, and squeeze the trigger. Fire three shots using the exact same point of aim for each shot. Do not adjust your dials after a single shot; you need a three-shot cluster to see where the gun is truly grouping.
4. Measure the distance to the bullseye: Walk downrange to inspect your target. Find the center of your three-shot group. Use a simple pocket ruler to measure how many inches that cluster sits away from the center bullseye. Measure the horizontal distance (left or right) and the vertical distance (high or low) separately.
5. Calculate your clicks: Red dot adjustments are measured in minutes of angle, often written as MOA. One MOA represents roughly one inch at 100 yards, one-half inch at 50 yards, and one-quarter inch at 25 yards. Check your sight body or manual for the click value. Many Truglo sights adjust at one-half MOA or one MOA per click. For instance, if your sight has one MOA clicks and you are shooting at 25 yards, each click moves your bullet impact only one-quarter of an inch. To move your impact one inch at 25 yards, you must turn the dial four full clicks.
6. Turn the adjustment dials: Remove the caps (and ensure lock screws are loose). Use your coin, screwdriver, or hex tool to turn the elevation and windage screws the required number of clicks. Rotate them in the direction of the stamped arrows to move the bullet hole toward the bullseye.
7. Fire a confirmation group: Aim back at the center bullseye from your bench rest and fire another three-shot group. If your math was correct, your new cluster will sit right in the bullseye. If it is still slightly off, repeat the measurement and make fine-tuning clicks.
8. Lock and cap your settings: If your red dot has rear locking screws, gently snug them back down clockwise with your hex wrench. Do not overtighten them; snug hand-tight tension is enough to lock the emitter in place. Screw the protective turret caps back on securely to keep dirt, rain, and moisture away from the click mechanisms.

Follow the Directional Arrows to Move Your Bullet Impact

The single biggest mistake shooters make when adjusting an optic is turning the screws backward. People often get confused about whether the dials move the glowing red dot or the hole in the paper target. Understanding this relationship keeps you from chasing bullet holes around the target paper.

The directional arrows stamped on your Truglo optic always indicate the direction your bullet impact will move. They do not describe where the glowing dot appears to float inside the glass. When an elevation dial says "UP" with an arrow, turning the screw in that direction raises the physical point where the bullet strikes the paper. The dial mechanically shifts the internal lens assembly so your gun barrel tilts upward to meet the reticle.

Here is how to translate what you see on your target into dial turns:

If your shots hit lower than your aiming point: You need your bullet holes to climb up toward the bullseye. Turn the top elevation dial in the direction of the "UP" arrow.

If your shots hit higher than your aiming point: You need your bullet holes to drop down toward the center. Turn the top elevation dial in the opposite direction of the "UP" arrow.

If your shots hit to the left of the bullseye: You need your bullet holes to travel toward the right side of the paper. Turn the side windage dial in the direction of the "R" arrow.

If your shots hit to the right of the bullseye: You need your bullet holes to travel back toward the left side of the paper. Turn the side windage dial in the opposite direction of the "R" arrow.

Consider an everyday example at the range. Suppose you are sighting in a rifle at 50 yards, and your optic features one-half MOA click values. At 50 yards, one MOA equals one-half inch, which means each click shifts your bullet impact by one-quarter of an inch. If your three-shot group lands two inches below the bullseye and one inch to the left, you need to lift the impact up two inches and shove it right one inch. To move up two inches, you turn the top elevation dial eight clicks toward the "UP" arrow. To shift right one inch, you turn the side windage dial four clicks toward the "R" arrow.

Adjust the Rheostat Dial for Clear Reticle Brightness and Color

Getting your shots centered also depends on how clearly you see your aiming point. If your red dot looks like an exploded star or a blurry red blob covering the entire bullseye, your dial settings might be fine while your illumination level is wrong. Truglo red dots use an adjustable rheostat knob to control the intensity and color of the aiming reticle.

The rheostat is typically located on top of the tube or stacked on the left side of the optic body. It features numbered markings, usually ranging from 0 to 5 or 1 to 11. Position "0" turns the internal LED completely off to prevent battery drain. As you rotate the dial to higher numbers, the internal circuit sends more power to the emitter, making the dot brighter.

Many Truglo models offer dual-color reticles, allowing you to choose between a red or green dot. The dial on dual-color sights typically features two separate numbered scales: one printed in red and the other in green. Rotating the knob into the red section illuminates a red aiming dot, while rotating into the green section activates a green aiming dot.

Choose your reticle color based on your shooting environment. Green reticles are exceptionally easy for the human eye to track in bright midday sunlight, against gray dirt, or on dark indoor shooting lanes. Red reticles provide sharp contrast against outdoor natural cover, leafy timber, and green foliage, making red a preferred choice for hunting woods or brush country. Pick the color that gives you the cleanest contrast against your specific target background.

Always adjust the brightness setting to match the ambient light around you. A common error is turning the brightness up to maximum during overcast days or in dark shooting stalls. When the dot is set too high for ambient lighting conditions, the light overpowers your eye and creates optical bloom. This bloom makes a precise 2 MOA or 5 MOA dot look twice its actual size, obscuring the bullseye and making tight grouping impossible. Lower the rheostat until the dot is sharp, crisp, and translucent enough that you can still see the center of your target directly through the glowing dot.

FAQs

How many clicks on a Truglo red dot move the bullet impact one inch?

The number of clicks required depends on your target distance and the specific click rating of your sight. On an optic with one-half MOA clicks, moving your impact one inch at 100 yards takes two clicks, while at 50 yards it takes four clicks, and at 25 yards it requires eight clicks. Check your optic manual or the stamped label on your turret to confirm your model click value before calculating adjustments.

Why is the adjustment screw on my red dot stuck and refusing to turn?

If you have an open-window reflex sight, you most likely forgot to loosen the rear locking screws. These small set screws physically clamp the adjustment plates to prevent movement under recoil, and forcing them will strip the internal gears. Enclosed tube models do not have lock screws, so if a tube sight dial will not turn, it has reached the end of its internal travel or suffered internal thread binding.

Should I turn the dials to chase the bullet hole or the bullseye?

Always turn the dials in the direction you want the bullet impact to move toward the bullseye. The stamped arrows on your sight represent bullet hole movement on paper, not the visual movement of the dot in the glass. If your shot lands low and to the left of the center, turn the top dial toward "UP" and the side dial toward "R" to walk your hits back into the bullseye.

Why does my aiming dot look like an irregular starburst instead of a round circle?

A starburst effect usually happens when the rheostat brightness knob is set too high for your ambient lighting, which causes the LED light to flare. Turn the brightness dial down several clicks until the reticle forms a sharp, distinct dot. If lowering the brightness does not solve the flare, you may have mild astigmatism in your shooting eye, which you can verify by looking at the dot through your smartphone camera screen.