Primary Arms PA CS 21MM MICRO RFLX AUTOLIVE 3MOA

The Primary Arms PA CS 21MM Micro Reflex Sight features AutoLive motion-activated illumination paired with a daylight-bright green reticle. It is optimized for compact and micro-compact pistols, using a slightly smaller 21mm lens to maintain a slim profile and avoid slide overhang on smaller handguns. The sight uses the RMSc footprint for broad compatibility with milled slides and adapter plates and houses a bottom-mounted CR2032 battery. The housing is machined from 6061 aluminum and the lens is fully multicoated for durability and clarity.

Key Specifications

• The sight is a Reflex optic designed for close-range aiming.
• The reticle is a 3 MOA green dot for quick target acquisition.
• The objective/lens measures 21mm to keep the profile compact.
• The optic operates at 1X magnification for an unmagnified sight picture.
• The housing is constructed from 6061 Aluminum with an anodized finish.
• The sight fits RMSc footprint slides and adapter plates.
• The illumination uses AutoLive motion activation to conserve battery life.
• Power is supplied by a bottom-mounted CR2032 battery.
• Battery life is rated up to 40,000 hours on the medium setting.
• The lens is fully multicoated for scratch and fog resistance.

Compact, low-profile, and purpose-built for concealed-carry and micro-compact pistols, this Micro Reflex Sight balances size and usability without sacrificing durability. The motion-activated AutoLive system and long CR2032 battery life reduce user maintenance, while the RMSc footprint and anodized 6061 aluminum housing ensure wide compatibility and rugged service life. For those seeking a discreet, fast-to-acquire optic for everyday carry or compact pistol applications, this sight provides a practical, dependable solution.