Osight K (RMSc 6 MOA Open)

The Osight K is the budget open-emitter entry in Osight's RMSc lineup, sized for slim subcompact and micro-compact carry pistols. The 6 MOA dot is the largest single-dot reticle Osight offers, optimized for fast pickup under stress at typical defensive distances. Motion sensor activation triggers on the slightest movement and powers the optic down after three minutes of inactivity to conserve battery.

Power is a side-loading CR1620 tray, allowing battery swaps without pulling the optic off the slide and preserving zero. A low-power indicator triple-flashes once per minute when the cell drops below 2.2 V, giving early warning before total dropout. The brightness ladder is the standard Osight 8 daylight + 2 night-vision arrangement. Construction is aluminum housing with an aspherical lens Osight rates as parallax-free.

Footprint is Shield RMSc, fitting the SIG P365 family, Glock 43X/48 MOS, and other slim optics-ready slides. At $159.99 the K sits at the bottom of Osight's pistol optic line and competes directly with the Holosun 407K X2 ($259) and Swampfox Sentinel II at a meaningful discount. The tradeoff against the SE Green is the open-emitter format and the slightly smaller window. Choose the K for absolute lowest price; choose the SE Green for the enclosed-emitter durability advantage at $150.