This is the enclosed pistol optic for a compact or full-size slide, about Glock 19 size and up. The LED sits behind a sealed window, so lint, rain, and mud stay off it. The reticle is a 2 MOA dot, a 32 MOA circle, or both, and you can leave it on whichever one you actually use.

Solar is the backup, and the CR1620 loads from the side, so you are not pulling the optic to change a battery. It weighs about 1.4 oz, with a window about 0.90 × 0.63 in. Holosun rates the housing IPX8. That is a sealed-housing rating, not an invitation to take it swimming.

The body uses the Holosun K footprint. The box includes an RMR-to-K plate, which is how it mounts on an RMR-cut slide. That plate sits a little higher than a 507C bolted straight to the same cut, which is worth knowing if your irons were cut to meet a direct-mount optic. The EPS is too wide for a slim micro slide. Those guns use the EPS Carry.

The window is a bit tighter than an open 507C. In return, the emitter still works when the gun lives in a holster or a wet range bag.