Holosun AEMS EVO

The EVO clamps with a nut that drives a clamping block against the rail slot, and Holosun publishes a real number for it: 5.6 to 7.3 Nm, which is 50 to 65 inch-pounds. An 11 mm hex wrench comes in the box alongside Torx T10 and T6 tools.

The included wrench turns the nut but no torque wrench will accept it, so an 11 mm socket from your own toolbox is the only way to measure the spec instead of guessing at it. Clear the firearm and remove the magazine before the optic goes anywhere near it.

The cell sits in a side tray held by two screws, so a battery change never breaks the mount and never costs you zero. One CR2032 ships taped to the second page of the manual, which is easy to throw out with the packaging.

Holosun rates the EVO at up to 100,000 hours on one cell at brightness setting 6, double the figure it quotes for the AEMS Pro X2. The tray carries an o-ring that backs the IP68 rating and the nitrogen fill, so look at it every time the tray is out.

Turret locations follow the AEMS layout rather than Holosun's tube sights: elevation is on the RIGHT side of the housing and windage on the LEFT. If your habit comes from a 403B or a 512C, where elevation sits on top, you will reach for the wrong screw the first time.

Each click is 0.5 MOA, which the manual states as 14.5 mm at 100 meters, and total travel is plus or minus 1.45 m at 100 meters, or plus or minus 50 MOA. Direction also runs opposite the tube sights: clockwise on elevation RAISES point of impact here, and clockwise on windage moves it right.

The EVO's two buttons are on the left side of the housing, not the top. A single press of "+" or "-" powers the sight on in auto mode, where the solar cell plus a front-facing light sensor set reticle intensity. That forward sensor reads the light on the target side rather than the light behind the shooter, which is the difference that matters moving from a bright exterior into a dark doorway.

Holding "+" for 3 seconds drops the sight into manual mode, and holding "+" for 3 seconds again puts it back in auto. Manual mode carries 12 settings: 8 for daylight and 4 for night vision devices, twice the night vision granularity of Holosun's tube sights.

The EVO ships with transparent glass flip caps front and rear, and Holosun is explicit that using the sight is not affected when they are closed. Lift the fastener and the cover springs open.

Both the flip cap and the kill flash mount with two screws underneath. Holosun's own note is that a reticle reflection off closed glass caps is a property of glass in front of an optic rather than a fault, so judge the reticle with the caps open before deciding something is wrong with the sight.