Primary Arms has updated their SLx MD-25 red dot optic to a Gen 2. The Gen 2 gives you all the great stuff as the first generation, but it now includes Primary Arms’ AutoLIve. With the added AutoLive function, this makes a great red dot for either a rifle or carbine. There are two versions available, one with just a red dot, or one with an ACSS reticle. I received the ACSS version, so everything here will be on the MD-25 Gen 2 with the ACSS CQB reticle. Most of the specifications, except the reticle, apply to the dot only version of the MD-25 Gen 2 also.

Let’s start this out with an AutoLive explanation. The AutoLive function, of the MD-25 Gen 2, automatically turns the red dot “On” when you pick up or move the optic. It also turns the optic into a sleep, or “Off” mode, after a few minutes of no movement. A big advantage to an auto-on reticle/dot is that it is ready when you need it to be. The AutoLive also extends the battery life, since your optic isn’t “on” all the time. Whatever setting the brightness dial is set to, is the brightness that it turns on at. No readjusting necessary. I absolutely love the AutoLive function. Speaking of brightness, the MD-25 Gen 2 has 11 adjustments on a dial. From night vision compatible all the way up to super bright. The 2032 battery is also housed in the brightness dial. Primary Arms specs the battery life at 12000 hours on the medium setting, so 5 or 6 on the dial. Battery life might seem a little low to some people, but there is more information in the ACSS reticle. For comparison, the MD-25 Gen 2 dot only version has a 50000 hour battery life.

This particular MD-25 Gen 2 has the ACSS CQB reticle. If you don’t know anything about the Primary Arms ACSS reticles, they are usually a horseshoe line around some sort of chevron (think triangle). The horseshoe on the Gen 2 measures 65 MOA. The chevron triangle sits inside the horseshoe and is used as your main aiming spot. For close up work, just cover the target with the chevron. For more precise work, use the top point of the chevron. The ACSS CQB then has three dots below the chevron. These dot’s are for ranging, as is the bottom of the chevron. The reticle can work with a few different common caliber options as seen in the photo. I like the ACSS CQB reticle, but it is pretty small, so it can be difficult to make out the aiming points for different ranges. The MD-25 Gen 2 is still a red dot style optic. So this means that the image is projected onto the viewing surface. It is not an etched reticle like a scope. This really only affects you if you have an astigmatism, which I do. So for me, the chevron “starbursts” out and looks more like a dot. This is just something to take into consideration. If you have decent vision, the reticle will be very clear. For my use, the MD-25 Gen 2 is not a long range optic, so this doesn’t bother me at all. When shooting real close targets, an advantage to the ACSS CQB reticle is that you can figure out how far above a target you need to aim, to compensate for mechanical offset. Those dots below the chevron, as well as the 65 MOA horseshoe, also help for aiming at those close targets. You don’t have this option with a standard dot only reticle, which is why I feel the ACSS CQB is a better reticle option for an AR rifle.

The Gen 2 MD-25 is not one of those super tiny red dot optics. I’d say it is medium size. Not so small that it’s hard to see through, and not so large that it’s a tank sitting on your picatinny rail. It only measures 3” long, so almost half the length of those expensive “red dots”. The MD-25 uses 25 mm lenses, but the field of view is really good. Primary Arms says it rivals 30 mm red dots, and I believe it after looking through the MD-25. Even though the MD-25 isn’t a small red dot, it still only tips the scales at 6.5 ounces. It also comes with different mounting height options. So no matter what you put it on, you can get the sight right up to your eye level. If for some reason you don’t like the supplied mount, the MD-25 can be mounted on standard T1 And T2 micro mounts.

I’ve been really impressed with the MD-25 Gen 2. It is built super strong. I’m not sure I could break it if I tried. Even if I was to, it’s covered by Primary Arms’ lifetime warranty. The little capped turrets even have raised nubs to keep them protected. These protection nubs will also keep stuff from snagging on the turrets, or at least help. The little turret caps also are aggressively textured with an adjustment built into them for making sight adjustments. The mount is also super strong. Once clamped down, the MD-25 isn’t going anywhere. I wouldn’t hesitate to put this on a rifle that gets beat around some.

If you are looking for a rugged red dot, that’s not a dot, look into the Primary Arms MD-25 Gen 2 ACSS. This thing is a great size for almost any rifle. It has a ranging type ACSS reticle that even works with a .22 lr. The AutoLive gives you plenty of battery life, over a years worth, and it makes the optic “always ready”. Go check out the SLx MD-25 Gen 2 over at Primary Arms, It’s a good red dot style sight with a unique reticle.

Firearms Insider Reviews - 8 Key Points

Claim to Fame:

Larger window red dot

Target Market:

Those wanting an auto on/off red dot with a ranging reticle

FNBs (Features & Benefits of this product):

AutoLive functionality
Wide field of view
ACSS CQB reticle
Up to 12,000 hour battery life at medium setting
Uses one CR2032 battery (included)
Next generation ruggedized mounting system
Includes risers and spacers for mounting to 0.96”, 1.41”, 1.54”, or 1.64” central height
Compatible with standard micro mounts
Fully multi-coated anti-reflective lenses
12 Illumination settings, night vision compatible
3" long
Weight - 6.5 Oz.
Fog resistant
0.5 MOA adjustments
Lifetime Warranty

What other aesthetic options or finishes are available?

Dot Only version

What others are saying?:

5/5 stars on Primaryarms.com

This is my 5th or 6th scope purchase from PA. I've never been disappointed yet, so when this one was announced I quickly put it on pre-order to replace a Vortex SPARC that I've never been happy with. I bought this to go on a home defense bullpup shotgun. It is fantastic for this purpose. The big outer circle, with the small aiming dot in the middle, is perfect for fast sight acquisition, and the shake-awake feature gives you one less thing to think about in a crisis situation. The included height adjustment plates let you tailor the height of the sight to your own weapon and preferences. Just another area where PA beats the competition in quality, value, and price. With eleven brightness settings on this reticle, you see it outside in the brightest sun, all the way down to night vision compatibility. I usually prefer green illumination over red, but this sight is extremely clear and my old eyes have no problems with it. - Highly recommended.