US Optics ER25 Review
I recently had the opportunity to evaluate a US Optics ER25 with Alamo Four Star DLOC mount website on my new Desert Tech SRS Covert. It was set up with the 16” 308 barrel and outfitted with a YHM Phantom suppressor. The pairing was excellent.
This was actually my first time shooting a USO scope, although I do own the 15-40 field scope and use it all the time. Opening the box was an eye opening experience. This optic is meant to stand up to the end of the world. It is massive and makes the Desert Tech seem small despite the rifle’s size. The scope bell actually stuck past the shortened forearm of the Covert chassis slightly after getting the eye relief set.
Inspecting the scope out of the box reveals just how much quality is built into it. The construction is solid and that term doesn’t even describe it enough. If the M1 Abrams was a scope, it would be the ER25. The EREK elevation knob is a focus point of the design with its impressive 110 clicks per revolution. The large size makes grabbing it with gloves easy and the clicks are very positive. The windage knob has a zero point and then ascending numbers with “R” and “L” next to them to indicate direction. The elevation knob actually doesn’t have any marks indication direction, only numbers.
Experimenting with the 3 button illumination showed the center dot is all that illuminates. However, if you turn it up higher, everything seems to get a back light when it is dark outside. It can actually be too much in really low light so I wouldn’t use it that way. Allowing only the center dot to illuminate doesn’t over power the target making those critical low light shots easy to make. Speaking of low light, one range session went late into the day and I could still hit the target at 500 meters despite being well after official daylight hours. The light gathering ability of the 58mm objective lens was impressive. I found myself shooting later than I had intended since I could still so easily see my target and I ended up having to pick up my steel by truck headlights when I was done.
It did take me some time to get used to MIL adjustments I admit. I have been a MOA shooter my entire life and kept finding myself over compensating. My fumbling obviously is no fault of the scope but it did make me question if I was adjusting the elevation correctly since there was no “up” and “down” marked on it. Eventually I got everything on track (myself mainly) and was shooting groups. I immediately started stretching out the shots to the steel we had set up.
Clarity was pristine. It was a clear sunny day and that 500 meter target may as well have been 5 meters looking through the glass. At the highest magnification I could easily dope my own wind as the mirage could be seen. After the suppressor warmed up, I had to turn the magnification down because of the heat being generated right below the objective lens was making the target obscured. This was a new gun and the first time I had a suppressor and scope so near each other due to the bullpup design. I will be getting a wrap now.
The Horus reticle was very handy and I was able to just use hash marks for hold over at 400 and 500 meters instead of adjusting the elevation knob. I know that isn’t the “right” way but I wanted to see how easily I could snap between different distances and make hits. It was effortless to get consistent hits at distance. The first focal plane made sure that, even when I turned down the magnification due to the mirage, that my same hash marks still rang steel. I am a firm believer in first focal plane scopes and their ability to help the shooter judge distance and make hits not matter the power setting.
US Optics has done it right with this beast. There is no doubt that this is top tier glass with all the features you could want. When (not if) I purchase one, it will be in MOA and I would add the internal bubble level. I have an old scope of another brand with this and love it. I am very happy to see USO offer it as an option. In case you have never been to their website, you need to see just how many different options you have to get the scope of your dreams exactly like you want it. These are built to last and your grandchildren will get as much enjoyment out of them as you will.