Holosun HS510C & HM3X Red Dot Sight + 3X Magnifier

Holosun HS510C & HM3X Combo — Open Reflex Sight with 3X Magnifier

The Holosun HS510C & HM3X Combo pairs a multi-reticle open reflex sight with a flip-to-side 3X magnifier to deliver fast, flexible target engagement on modern long-gun platforms. Designed for rifles, carbines, and PCCs, this optic package allows shooters to transition instantly between unmagnified speed and short-range magnification using a single Picatinny-mounted system.

Manufactured by Holosun, this combo is built for practical use in training, range, and duty-style configurations. The HS510C provides an unlimited-eye-relief, parallax-free sight picture with selectable reticle options optimized for close-range shooting, while the HM3X magnifier adds 3X optical power for improved target identification and engagement at intermediate distances. Together, they form a compact, durable solution for shooters who need versatility without changing optics.

Core Description

The HS510C is a 1x open reflex sight featuring Holosun’s Multi-Reticle System, allowing the user to select a 2 MOA dot, a 65 MOA circle, or a combined circle-dot reticle. Solar-assist technology supplements the CR2032 battery to extend operating life, while a titanium hood protects the aluminum housing from impact. The HM3X magnifier mounts behind the optic on a flip-to-side mechanism, enabling rapid switching between magnified and unmagnified views without removing the optic from the rifle.

Key Features

• Multi-Reticle System: 2 MOA dot, 65 MOA circle, or combined reticle options

• Dual power operation: Solar-assist with CR2032 battery backup (HS510C rated up to 50,000 hours at specified setting)

• HS510C housing: Aluminum body with titanium hood and MAO surface finish

• Environmental rating: HS510C listed as shockproof and IP67 submersion-rated

• HM3X magnifier: Fixed 3X magnification with adjustable diopter

• Flip-to-side mount: Ambidextrous quick-release Picatinny mount with included spacer

• Adjustments: 0.5 MOA per click windage and elevation on HS510C

• Optics: Multi-coated lenses with red reticle (~650 nm) and 12 brightness settings (10 daylight, 2 night vision compatible)

• Eye relief & field: Unlimited eye relief on HS510C; ~2.75″ eye relief and ~7° field of view on HM3X

Specifications & Construction

• Magnification: HS510C 1x / HM3X 3x

• Battery Type: CR2032 (tray compartment on HS510C)

• Materials:

  • HS510C: Aluminum housing with titanium hood

  • HM3X: 6061 T6 aluminum, anodized finish

• Mounting Interface: Picatinny / Weaver (1913)

• Weight (as listed):

  • HS510C: approx. 4.94 oz

  • HM3X: approx. 1 oz

• HS510C Dimensions (example listing): 3.3 x 1.68 x 1.78 inches

Compatibility & Intended Use

This combo is designed for firearms equipped with Picatinny (1913) rail systems, including AR-pattern rifles, PCCs, and other long guns. Typical setups include a primary reflex sight for close-range engagement with the HM3X magnifier flipped into place for intermediate distances. The included spacer supports absolute or lower 1/3 co-witness configurations, allowing compatibility with common iron sight heights.

The Holosun HS510C & HM3X Combo offers a practical balance of speed, magnification, and durability. Supporting search terms include Holosun 510C magnifier combo, reflex sight with 3X magnifier, Picatinny-mounted red dot and magnifier, and carbine optic combo. This package is well suited for shooters who want a single optic solution adaptable to changing engagement distances.