AGM Comanche-40ER Night Vision Scope Setup

Quick answer

Mount the AGM Comanche-40ER on a standard Weaver or Picatinny rail in front of your day scope, then adjust the diopter and focus ring until the reticle and target are sharp. Zero the system by aligning the clip-on's internal aiming reference with your day scope's point of impact.

Step-by-step setup

1. 1. Mount the clip-on to the rail: Slide the Comanche-40ER onto the Weaver or Picatinny rail forward of your day scope. Tighten the locking lever by hand until snug. Do not overtighten — the lever should close with moderate resistance. Common mistake: mounting the clip-on too far forward or backward, causing the eyepiece to be out of reach or the unit to interfere with the day scope bell. Check that the clip-on sits flush against the rail and does not rock side to side.
2. 2. Adjust the diopter and focus: Look through the day scope with the clip-on powered on. Rotate the diopter ring (nearest your eye) until the reticle appears sharp. Then turn the objective focus ring until the target image is clear. Common mistake: adjusting the focus before the diopter, which leads to a blurry reticle even when the target is sharp. Always set the diopter first, then the focus — never reverse the order.
3. 3. Align the clip-on with the day scope: With the rifle on a stable rest, aim the day scope at a known target at 50–100 yards. Look through the clip-on and note where its internal aiming reference (typically a crosshair or dot) falls relative to the day scope's reticle. Use the windage and elevation adjustments on the clip-on to bring the two aiming points together. Common mistake: trying to zero the clip-on without first confirming the day scope is already zeroed. The day scope must be zeroed before you begin — the clip-on only aligns to it, not to the bore.
4. 4. Verify with a live-fire group: Fire a three-shot group using the clip-on's aiming reference. Compare the group center to your point of aim. If the group is off, make small adjustments (1–2 clicks) on the clip-on's windage and elevation turrets, then fire another group. Common mistake: making large adjustments after a single shot, which overcorrects for shooter error rather than true misalignment. Fire at least three shots per adjustment step to average out human error.
5. 5. Secure and protect the setup: Once zeroed, verify the locking lever is tight and consider adding a lens cap or cover when not in use. The Comanche-40ER is designed for field use, but keeping the objective lens clean and protected extends its service life. Common mistake: leaving the unit powered on in bright daylight, which can damage the intensifier tube. Always turn off the clip-on and cap the lens when moving between dark and bright environments.

Product facts

• AGM Comanche-40ER 3AL1: The Comanche-40ER mounts to a standard Weaver or Picatinny rail in front of an existing day scope. You do not need a special rail or adapter; any rifle with a top rail can accept the clip-on, making it compatible with most hunting and tactical setups.