Primary Arms SLx MD-25 Gen 2 ACSS CQB by Primary Arms - $199.99 | 2026 Review

Compatibility Tags

interface: picatinny-topsuitable-for: ultra-compactoptic-type: reflexoptic: aimpoint-micro

Overview

The MD-25 Gen 2 gives the ACSS CQB reticle a 25mm clear aperture, five millimeters wider than the 20mm opening on the MD-21 models. Its rotary knob selects 11 brightness settings, including two for night vision, while AutoLive wakes the illumination when the rifle moves. At 6.5 oz and 3.0 inches long, it trades some compactness for the larger viewing window.

The fixed reticle combines an open-top horseshoe for fast pickup, a center chevron for a precise zero, and three stacked BDC dots. The horseshoe approximates the 25-yard pattern of 12 gauge 00 buckshot from an 18.5 to 20 inch barrel. The chevron spans can also range an 18-inch target at 300 and 400 yards, and the dot stack supplies calibrated references for several rifle, shotgun, rimfire, and carbine loads.

Adjustments move 0.5 MOA per click, with more than 50 MOA of total windage and elevation travel. That is less published travel than the 100 MOA available on each MD-21, but the mounting kit is more flexible: the low mount, riser, and two spacers set the center at 0.96, 1.41, 1.535, or 1.64 inches. The 6061-T6 aluminum housing is hardcoat anodized, nitrogen purged, fog resistant, and IP67 rated, and the ACSS model's CR2032 is rated for 12,000 hours rather than the 50,000 hours listed for the plain 2 MOA dot version.

Key Features

Fixed ACSS CQB reticle with open-top horseshoe, center chevron, and three BDC dots
25mm clear aperture with rotary brightness control
11 brightness settings, including 2 night vision settings
AutoLive motion-activated illumination
0.5 MOA clicks with more than 50 MOA of windage and elevation travel
Low mount, riser, and two spacers provide four center heights
6061-T6 aluminum, nitrogen purged, fog resistant, and IP67 rated

Detailed Specifications

Reticle: Fixed red ACSS CQB: open-top horseshoe, center chevron, and three stacked BDC dots
reticleSubtensions: Chevron outer tip span is approximately 5.7 MOA, inner tip span is approximately 4.3 MOA, and BDC dot diameter is approximately 1 MOA, derived from the manual's ranging references; no horseshoe MOA value is published
bdcCalibration: Six references from top to bottom are chevron tip, outer wing tips, bottom legs, then BDC dots 1, 2, and 3. Yardages: 5.56/5.45 with 100 yd zero, 100/200/300/400/500/600; .308, 6.5 Grendel, or 77gr 5.56 with 50 yd zero, 50/200/300/400/500/600; 300 BLK or 7.62x39 supersonic with 100 yd zero, 100/200/250/300/400/450; 300 BLK 200gr SMK subsonic with 50 yd zero, 50/no reference/75/100/125/150; 12 gauge 1 oz slug with 25 yd zero, 25/50/75/100/125/150; .22LR 40gr with 50 yd zero, 50/no reference/100/125/150/175; 7.62x54R zeroed 1/2 inch below point of impact at 100 yd, 100/200/300/400/500/600; 9mm carbine 115/124gr with 25 yd zero, 25/no reference/100/150/175/200; 10.5 inch 5.56 with 100 yd zero, 100/200/250/300/400/500. Load and barrel length variation may require tuning with the top BDC dot at extended distance
rangingAndWind: Chevron outer tips range an 18 inch target at 300 yards, inner tips range it at 400 yards, chevron edges mark 5 MPH wind holds for 400, 500, and 600 yards, and each BDC dot covers a 5 inch target at 500 yards. Vertical ranging for a 5 ft 10 in standing target uses the lowest BDC dot and marks 500, 600, and 0 to 400 yard bands, best used behind a magnifier
shotgunReference: Horseshoe approximates the pattern of 12 gauge 00 buckshot from an 18.5 to 20 inch barrel at 25 yards
reticleManual: https://www.primaryarms.com/core/media/media.nl?id=19316853&c=3901023&h=WjciESL8oc0DMQiXy062cozHLzkZZyxsoF2IyBJzIJMnPDA
Magnification: 1x
Battery Type: CR2032 3V lithium coin
Battery Life: 12,000 hours with the ACSS reticle
brightnessSettings: 11 levels, including 2 night vision settings
activation: AutoLive motion-activated illumination
Waterproof Rating: IP67
fogResistance: Nitrogen purged and fog resistant
weight: 6.5 oz with battery, without lens covers
Length: 3.0 in
windowSize: 25mm clear aperture
Adjustment Type: 0.5 MOA per click
Adjustment Range: More than 50 MOA total windage and elevation
Material: 6061-T6 aluminum with hardcoat anodized finish
Mount Type: Standard microdot and Aimpoint Micro footprint
includedMountHeights: 0.96 in, 1.41 in, 1.535 in, and 1.64 in center heights
color: Black
sku: PA-SLX-MD-25-G2-ACSS
mpn: 810033
warranty: Lifetime