EOTech EXPS2 vs EXPS3 vs XPS: What the Model Numbers Mean

Start with the names. EOTech's pages do not spell out what the letters stand for, so treat EXPS and XPS as two body styles. What the pages do state is that XPS2 is the non-night-vision version of the shortest and lightest HWS to date, and that XPS3 is the shortest and lightest night-vision-compatible HWS. The same 2 and 3 split runs through the EXPS pair. That makes the grid easy: pick a body, then pick whether you need night vision.

Night vision is the one difference that changes how you can use the sight. The 3 models list 20 daylight settings plus 10 additional settings for Gen I through III+ night vision devices. The 2 models list 20 daylight settings only, and their spec tables read Night Vision Compatibility: No. If you run a night vision monocular or goggles, or think you will, buy a 3. If you shoot in daylight and under white light, a 2 does everything you need and EOTech lists it for less than its 3 equivalent. Buying a 3 just in case can make sense because it keeps your options open, but it is paying for a feature you may never use.

Size and weight come next. The XPS2 and XPS3 are listed at 3.8 by 2.1 by 2.5 inches (length, width, height) and 9.0 ounces. The EXPS2 and EXPS3 are listed at 3.8 by 2.3 by 2.9 inches and 11.2 ounces. So the EXPS is 2.2 ounces heavier, 0.2 inch wider and 0.4 inch taller, with the same length. On a light carbine or a pistol-caliber carbine, 2.2 ounces on the front half of the rifle is noticeable. On a general-purpose rifle with a magnifier and a light, it is small next to everything else you carry.

Height matters for more than looks. That 2.5 or 2.9 inch figure is the overall height of the sight, and it affects how the sight lines up with your iron sights and how your zero behaves at close range. EOTech says the EXPS2 provides co-witnessing with iron sights, and that the EXPS3 has a 7 mm raised quick detach base for a lower third iron sight co-witness. The XPS pages say the compact body frees rail space for rear iron sights or magnifiers, but they do not state a co-witness height. Check the fit with your own iron sights before you rely on it. Our guide to zero distance with a tall optic mount explains why a taller sight changes your close-range holds.

Mounts and buttons are the other body difference. The XPS models use a cross-bolt attachment, which clamps to the rail with a bolt. The EXPS models use an adjustable, locking quick detach lever, which EOTech describes as fast, secure attachment and easy removal. Quick detach is handy if you swap the sight between rifles, or take it off for storage. After any removal and remount, confirm your zero before you trust it. The buttons sit on the back of the XPS and on the side of the EXPS. EOTech notes that the EXPS2's side buttons make it simple to pair with a magnifier. If you plan to mount a magnifier behind an XPS, make sure you can still reach the buttons with it in place.

Battery life is the same on paper for all four. Each takes one CR123 lithium battery, and EOTech lists 1,000 continuous hours at the nominal setting at room temperature. The 2 models carry a footnote of 600 hours for the green reticle, and the green-reticle variants EOTech lists today are on the 2 models. Those hours drop at higher brightness settings and in the cold, and EOTech rates operation from minus 40 to 140 degrees Fahrenheit. A holographic sight draws more power than a simple red dot, so carry a spare CR123 and change the battery on a schedule you choose rather than waiting for it to fade.

Water resistance is listed at 10 feet for the 2 models and 33 feet for the 3 models. For most shooters in most weather, either is fine. It matters if the rifle will be dunked, carried in boats or used around heavy surf.

Reticles overlap but not completely. All four offer the 68 MOA ring with a 1 MOA dot and a two-dot version with 2 MOA dots. That ring is 68 MOA across, which is about 71 inches at 100 yards using 1.047 inches per MOA, and it is calibrated for a .223 62 grain load at 2,900 feet per second. Other calibers need their own aiming points, which you work out by shooting at known ranges. The 3 models also list a DCR reticle, a ring with a top cutout and a chevron at the bottom. EOTech says that if you zero a .223 or 5.56 rifle at 50 yards, the DCR gives aiming points out to 200 yards and a close-range solution at 7 yards. EOTech lists a 300 Blackout reticle on the XPS2 and a four-dot reticle on the EXPS3.

So which one? Choose the XPS2 for the lightest, smallest option with no night vision, for example on a compact carbine or home-defense rifle. Choose the XPS3 for the same small body if you run or plan to run night vision. Choose the EXPS2 if you want quick detach and side buttons and do not need night vision. Choose the EXPS3 if you want night vision settings, quick detach and the raised base in one sight; it is the full-feature option and the heaviest of the four.

Before you buy, check four things: that the rail on your rifle takes a 1 inch Weaver or MIL-STD-1913 mount, that you can reach the buttons with your magnifier and light mounted, that the model on the box says 2 or 3 as you intended, and that you have a spare battery. A holographic sight is a good fit for fast, two-eyes-open shooting at carbine distances. If you shoot out to 300 or 400 yards, compare it with a magnifier or a low power variable optic. Our guides to red dot sights for AR-15 pistols and home defense, red dot magnifiers versus LPVOs and prisms, and LPVO versus ACOG for a 16 inch AR cover that choice.