Shot Show Optics: DI Optical EG1 and DCL-120


DI Optical is a relatively new name at the Shot Show and the US commercial market. However, the South Korea based optic maker have been building military optics for machine gun, automatic grenade launcher and large caliber auto-canon for 25 years. All branches of the US military and many of our NATO allies are users of DI Optical made gunsights.



The DI Optical DCL-120 machine-gun red-dot sight. It’s available for the Ma Deuce and the Mk.19. The main difference between the two are the mounting base and the ballistic range adjustment dial on the side. The DCL-120 is powered by two CR123 lithium batteries or powered externally from a 10-28 volt power source. (DCL-120 full spec). Someone need to make an AR-15 mount for this…..



DI Optical also makes smaller red-dot sight for rifle and carbine. The EG1 prism red-dot sight is their top-end offering. The sight features a robust housing make from billet aluminum by CNC process. The optical part of the EG1 is using a prism instead of lens that found on most red-dot sights. (the pictures were taken in my photo studio due to very bad lighting at the convention center’s small side hall. Thanks to DI Optical for the short notice T&E!)



The EG1 from the shooter’s view. Unlike the rectangular window or circular lens found on other red-dot/reflex/holographic sights, the DI Optical EG1 has an interesting octagon shaped ocular view. While it’s out of focus in the picture, the center dot is actually a crisp 1.5 MOA dot. The battery life is up to 9075 hours on the level #6 setting from a single CR2032 lithium battery.



The center of the sight is at 1.53 inch height. It looks like absolute co-witness with iron sights to me. The windage and elevation adjustment are both on the right side. The sight comes with two small detachable rubber hoods that provides extra lens shading when installed. The DI Optical EG1 prism red-dot sight has a MSRP of $470 but it’s available from Rainier Arms for $423. (EG1 full spec)

Writer and gear editor with articles published in major gun publications. A five year combat veteran of the US Marine Corps, Tim is also part of Point & Shoot Media Works, a producer of photography, video and web media for the firearms and shooting sport industry. Tim’s direct contact: Tyan.TFB -at-


  • Tyler McCommon

    That actually looks like something I might buy and the price point is just about there.

    • mig1nc

      Yeah, the only thing is for $400+ I expect Aimpoint-like battery life in 2016.

  • Twilight sparkle

    Since it’s a prism can you see a black reticle when it’s off?

    • Timothy G. Yan

      Prism red-dot sight is very different than magnified prism sight like ELCAN & Trijicon. The prism in the prism red-dot sight replaces the conventional front/back/other lens in the optic, and it also using the prism as a stress structure to make it a very tough optic. The other prism red-dot sight including the Meprolight M5, RDS and Leupold LCO.

      • Twilight sparkle

        I always thought of prism red dot sights as being similar to a leupold prismatic sight.

        • Timothy G. Yan

          Leuppy Prismatic is not a red-dot sight. It’s a (crappy) 1x magnified prism sight.

          • Twilight sparkle

            There still wasn’t that much competition when it came out. How is it different than any other prism sight other than a perceived quality difference? Is it functionally different than these new Korean sights?

  • Squirreltakular

    Anyone have experience with this thing? Definitely looks nice.

  • Hensley Beuron Garlington

    Seen this company’s big optics on those GAU-19/B Gatling guns.

  • Wingbert

    If I’m going to pay upwards of $400 for a red dot optic it damn well better be made by a country with a better manufacturing pedigree than Korea.

  • JamesRPatrick

    Oh that RDS is sexy.

  • Christian Hedegaard-Schou

    Regarding the big boy and this comment: “Someone need to make an AR-15 mount for this”

    Uhhh.. did you look at your own picture of it? It’s got a picatinny mount already in the base of the unit.

  • Fred Johnson

    I’ve tried one of DI Optical’s RV2 red dots recently. It sure seemed like a rock solid sight and the brightness range was impressive. The RV2 is older tech than EG1, but appears to use the exact same mount. I’d like to see one of the EG1 sights in person to see if the boxy housing makes for a much better sight.

  • Adam D.

    What’s the difference between having a lens and a prism?

  • SD

    Who makes the buis on that rifle?

    • Timothy G. Yan

      Fab Defense