OLIGHT Osight SE Green Dot Collimator — Black

The Osight SE is a compact green dot sight with an RMSc footprint, designed for pistols with a compatible milled slide or for use on lightweight carbines where weight matters. The green dot is engineered to reduce eye fatigue in bright conditions, where a classic red dot tends to wash out or appear less defined.

The RMSc footprint is one of the most widely adopted standards on current-generation duty and competition pistols: choosing a sight that follows this footprint means you can replace or upgrade the optic in the future without remilling the slide or fitting a different adapter plate. A practical advantage for anyone running the same pistol across different roles over the years.

The enclosed housing protects the emitter from dust and moisture without requiring any more maintenance than an open red dot sight: the front lens is the only exposed surface, and the easiest to clean quickly in the field. The trade-off compared to an open sight is a slightly narrower field of view, offset by the greater overall durability of the unit.

Key Features

• The green dot is more legible than red in very bright environments or under direct sunlight.
• The RMSc footprint ensures compatibility with most milled slides for compact and subcompact pistols of recent manufacture.
• The enclosed body isolates the emitter from the environment, reducing the risk of internal fogging and moisture ingress.
• The compact form factor keeps the weapon's centre of gravity low and the lateral profile slim, without compromising target acquisition.