So, from what I understand the Mk AR series of optics was put out by Leupold to be a budget friendly option for a quality optic. These start around $300 or so for the basic options and go up to around $500 for the SPR reticle. The SPR reticle is what really drew me in to this optic. It's a basic Mil/hash crosshair with a single green dot in the middle (Indicated in the name as with either SPR-G or SPR-R). I liked this, more so than the Vortex and Bushnell optics I tried out. Both had these fancy, first focal plane reticles that were a standard dot at 1X and a BDC horeshoe dark magic thing at 4X. They were busy, and crowded. Especially for that magnification range, the reticle with illumination has to be pretty bold and it just takes up too much glass. With the SPR, the point of focus for your eye is small, and very easy to pick up against the black crosshair. (In this picture, it's on 1.5x and the illumination is directly in the middle of the spectrum. This is a perfect bright green dot for overcast use. Obviously price played a huge roll. As with most things, I buy second hand - usually from someone that bought high end and then barely used it. It gets me a good deal on the backend and if there's already a scratch, I don't feel bad beating it up some more. I ended up paying right around $350 for this optic, with the Burris PEPR mount. That's a steal, no matter who you are. Another HUGE advantage to this optic is weight. I had a Bushnell 30mm 1-4 and it literally weighed twice as much. I believe this optic is somewhere around 9oz. The Bushnell was over a pound and a half with the mount. While zeroing, the turrets have a nice clean crisp click, and they track very well (numbers lining up with the hash mark on the scope body) with no wiggle at all. After zeroing at 100yds (recommended for this scope because of the BDC turret) you can unscrew the turret set screws and place the turret on Zero, then lock back down. Now, as long as you're using 55gr .223 the elevation turret will work some pretty neat magic. There are corresponding numbers on the elevation turret that at first make no sense - since they're not equally spaced. 1, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6 and 6.5. They're yardage markers. All the way up to 650yds. The 1 indicates Zero, at 100yds. I've actually used this out to 530yds with a very high success rate. Easy as pie - laser your target, then just click over to the appropriate range on your elevation turret, place the green dot on the target and squeeze the trigger. I've also used this at very short range (25yds) and at 1.5x, I can easily shoot with both eyes open, very fast with no issues. Just like having an RDS, though there's an eyebox. Which isn't too bad on this optic. Illumination is great. Daytime lume is very usable on the highest setting. Lowest setting is perfect for dark hallway use and doesn't cause any halo-ing around the dot. There's a button on the left hand side of the optic (it's the gold Leupold symbol) that controls all of the optics electronics. Press for on, press once to cycle through brightness and long pres to turn off. Now, that's not always necessary; and I find it very odd that Leupold doesn't advertise this next feature. The optic's electronics are movement sensitive. Meaning, after 5 minutes of inactivity - the illumination turns off. Pick up the rifle and it turns back on. I've tested this several times, and it works 100% of the time, every time. Overall, I'm extremely happy with this optic and have even considered picking up the 3-12 model for my MVP. I don't see me ever wanting or needing to swap this out, since it really is a do-it-all optic for my needs. Pros: Budget Friendly Light weight Great illumination Can always be left on Great optical clarity BDC turret works very well with the right load Cons: 1" tube doesn't allow maximum amount of light in Accessories are expensive (Throw lever, Leupold brand caps, etc.) Not a true 1x optic** ** This is something I wanted to make a longer mention on. The $1500 Vortex HD's are a true 1x. Meaning, at 1x zoom there's absolutely NO MAGNIFICATION. This is exactly what you'd expect with an RDS. On the Leupold, it's a 1.5x, meaning there's a slight magnification at the lowest level. Some people aren't bothered by this and some people get a killer headache looking through 1.5x with both eyes open. It hasn't been an issue for me at all, since my eye focuses solely on the green dot and everything else just blends. This doesn't mean this optic can't be used in a CQB fashion, because it certainly can as long as you're able to deal with the .5 magnification with both eyes open. I'm not sure why Leupold did this, but I assume it has something to do with the cost savings of the Mk AR series.