Collimator device Primary Arms SLx 1x Micro Prism iR Red ACSS Cyclops Gen II

SLx prism sights combine the fast target acquisition of a red dot, the precision of an optical sight, and compact size, which is why they are popular not only with astigmatic shooters but also with those seeking a versatile sight for short and medium range shooting.

The American brand Primary Arms, renowned for high-quality optics, red dots, prism sights, and shooting accessories, quickly captured the U.S. market by offering products with an excellent price-to-performance ratio. Most products from this brand come with a lifetime warranty, which underscores confidence in their offerings. Primary Arms is also known for its proprietary ACSS reticle, which helps novice shooters rapidly improve their marksmanship.

Primary Arms — American shooting optics with a lifetime warranty

Features of the prism sight Primary Arms SLx 1x Micro Prism ACSS Cyclops Gen II:

• Compact size and lightweight,
• optics coated with multi-layer coatings to improve light transmission,
• patented ACSS Cyclops Gen II reticle calibrated for 5.56 / .308 / 7.62×39 / .300 Blackout SUB ammunition,
• large exit pupil distance (50–152 mm) creates a generous eyebox allowing comfortable head placement without the need to maintain exact optical alignment,
• 25/100 meter field of view facilitates aiming at moving targets,
• Daylight Bright mode allows shooting even in intense sunlight,
• 13 daylight brightness settings + 3 night vision settings,
• quick-focus ring for the reticle,
• red illuminated aiming mark,
• durable sealed construction provides resistance to fog, rain, and shock,
• 1 MOA turret clicks are tactile and audible, easing zeroing,
• long battery life — up to 29,000 hours at medium brightness,
• AutoLive motion-sensor on/off technology,
• 8-step mounting height adjustment range, including Absolute Co-witness and Lower 1/3,
• sight with a high mount weighs only 215 g,
• reticle etched on glass is ideal for astigmatism and remains usable even without illumination,
• large reticle adjustment range up to 120 MOA (vertical and horizontal),
• lenses with multi-layer anti-reflective coating,
• anti-glare finish via hard anodizing,
• IP67 waterproof and dustproof nitrogen-filled housing protects optics from fogging,
• includes a reinforced Picatinny rail mount,
• sight covered by a lifetime warranty.

Primary Arms SLx 1X MicroPrism ACSS Cyclops is a compact prism sight with true 1× magnification belonging to the respected SLx line, known for reliability, innovation, and excellent value. In field tests, Primary Arms optics were tested on a SCAR 17 (.308 Win), where over 7,000 rounds were fired without damage to the sights.

The Primary Arms SLx 1x uses an improved ACSS 5.56 reticle etched on premium low-dispersion glass, the AutoLive illumination activation system, and a reinforced mounting base ensuring stiffness and reliable attachment to the firearm.

The SLx 1x is a true 1× prism sight that performs excellently for fast two-eyed shooting at close-range targets. Many shooters experience astigmatism — a vision condition that causes the dot on a red dot sight to blur or distort. This makes aiming at small, distant targets difficult. This problem can be solved by replacing a red dot with more expensive solutions — a holographic sight, a magnified optic, or a prism sight, which has become hugely popular overseas.

Primary Arms SLx 1X MicroPrism — a true 1× prism sight ideal for astigmatic shooters

Unlike red dots, prism sights feature a BDC reticle and deliver a much clearer image free from parallax error. They also provide greater precision at longer ranges while allowing two-eyed aiming with preserved situational awareness.

The sight has a sealed aluminum IP67-rated housing, providing resistance to fog, rain, and shock. It features a 10.3 mm exit pupil and a generous eyebox that allows fast target acquisition without requiring perfect optical alignment. As a result, the Primary Arms SLx 1X prism sight offers a wide field of view and is excellent for dynamic shooting at moving targets when there is not always time for perfect cheek weld. The proprietary ACSS Cyclops Gen II 5.56 / .308 reticle is etched on glass, making it visible regardless of time of day even without illumination. A rangefinder-style stadia for estimating target distance is incorporated under the aiming mark. The aiming mark is red-illuminated (horseshoe and chevron) with 13 daylight settings and 3 night vision settings. Using the AutoLive motion sensor extends battery life — up to 29,000 hours at medium brightness. After extended stillness AutoLive automatically turns off illumination, which is instantly restored when the firearm is moved.

ACSS Cyclops Gen II is Primary Arms’ proprietary reticle calibrated to the ballistics of 5.56 / .308 / 7.62×39 / .300 Blackout SUB. The central reticle features a thinner chevron (an inverted V) surrounded by a thicker horseshoe. Below the chevron is a holdover ladder for drop compensation and range estimation. The result is an intuitive reticle well-suited for dynamic short-range engagements and accurate medium-range shooting. ACSS is an extremely simple yet functional aiming system appreciated by both novice and experienced shooters worldwide.

The Primary Arms SLx 1X MicroPrism features a sturdy aluminum mount with critical steel components, ensuring stable and reliable zero retention. The kit includes 2 height options (Absolute Cowitness and Lower 1/3) allowing you to mount the sight at a preferred height.