Osight SE Enclosed (6 MOA Green)

The SE GN carries the Shield RMSc footprint and goes straight onto an optics-ready slide cut on that pattern. Osight specifies medium-strength (blue) threadlocker on the mounting screws and 15 to 17 inch-pounds of torque on each one.

Screw selection is the real work here, because the box ships seven different lengths across four thread pitches: three each of M3 by 10.5 mm, M3 by 11.5 mm, M4 by 9.4 mm, M4 by 10.5 mm, #6-32 by 0.433 in, #6-40 by 0.374 in, and #6-40 by 0.449 in, plus two spare battery compartment screws and the adjustment tool. Your slide's cut determines which pair is correct, and running an adapter plate changes the answer: in that case Osight defers to the plate manufacturer's installation instructions rather than its own.

A CR1620 ships installed behind an insulating film. Pull that film before the first use or nothing will happen when you press a button.

The SE GN powers up on a press of either button and powers down on both buttons held together for more than half a second. Motion sensing is on from the factory, which means the sight also wakes itself on movement and shuts itself off after three minutes without any. Brightness runs 10 levels: 1 and 2 are night vision settings, 3 through 10 are daylight, and 10 is the brightest. A memory function restores your last brightness level, motion sensing state, and on/off state after the sight powers down, so the gun comes out of the safe the way you left it.

The elevation turret sits on top of the housing and the windage turret on the side, both driven by the adjustment tool in the box. Each click is 1 MOA for windage and elevation alike, which is about 1 inch at 100 yards, 1/2 inch at 50 yards, and 1/4 inch at 25 yards. Total travel is plus or minus 35 MOA.

The 6 MOA dot changes how you read a group. A dot that size covers roughly 1.5 inches at 25 yards, so it will blanket a small aiming point entirely. Use a target with a defined edge or a larger aiming square and read your correction off the measured center of the group rather than off what looked centered behind the dot.

The SE GN uses a side-loading battery tray, so the cell changes with the optic still bolted to the slide and the zero untouched. That is the practical argument for this sight over an enclosed dot that has to come off to be fed.

The number that matters is the torque cap on the tray screw: no more than 2.5 inch-pounds. That is a sixth of what the mounting screws take, and running the same driver setting on both is how the tray screw gets stripped. Osight puts two spare battery compartment screws in the box, which tells you how often it happens.

Low battery announces itself: the reticle flashes three times within one second, repeating at one-minute intervals, once voltage drops below 2.2V. That is a replace-it-now signal, not a suggestion.