AT3 RCO and DELTA Red Dot/Magnifier Kit

This kit combines the AT3 RCO Red Dot Sight with Circle Dot Reticle, and the DELTA 3x Magnifier with Flip-To-Side QD Mount for a versatile, accurate, and durable optic setup.

This kit saves you 10% vs purchasing the components individually!

The RCO (Rugged Carbine Optic) Does It All – Circle Dot Reticle, Night Vision Compatible, with Riser Mounts to Fit Any Long Gun or PDW

Premium Features

• The reticle consists of a 2 MOA dot with 62 MOA circle, making target acquisition fast in any conditions
• Perfect for a 50/200 yard zero with the red dot, with a 7-yard holdover with the bottom crosshair
• A wide 25mm multicoated lens ensures a crystal-clear view of your target, and a broad field of view looking down the sight
• 2 night vision compatible settings with 9 daylight settings, with a battery life up to 50,000 hours on the lowest daylight setting
• Compatible with AT3’s RRDM and 4xRDM Magnifiers for great clarity at long range

Risers for Any Application

• The RCO includes a low mount as well as a high cantilever riser mount for Picatinny rails
• Both mounts are sleek and flush-fitting on both sides, making them snag-free
• Using the included risers and spacer, get Absolute Cowitness or Lower 1/3 Cowitness for your AR15
• Also great for AK rifles, CZ Scorpions, Tavor and X95, as well as many other modern shooting platforms

Tough and Protected

• Optimized for the AR, but tough enough to withstand harsh recoil from shotguns and high caliber rifles
• Included transparent lens caps keep your lenses protected while providing a complete look at your target
• Forged aluminum housing is our toughest yet, with shockproof and waterproof circuitry inside
• Windage and elevation knobs are flush-fit, with no need for protective caps that get lost
• It’s as tough as they come, but still backed by the AT3 Lifetime Warranty

Inside the box

• RCO Red Dot Sight with Low Mount
• High Riser Mount with Spacer and Screws
• Clear Flip-Up Lens Caps
• Torx Wrenches
• Instruction sheet (click here for download)
• Lens cloth
• CR2032 Battery



The DELTA has better glass clarity, longer eye relief, and an excellent QD mount!

The DELTA is AT3’s new red dot magnifier, boasting a long 3 inch eye relief, a broad field of view, and enhanced clarity for making accurate, long-range shots with your red dot sight. This magnifier works with any red dot sight with absolute or lower 1/3 cowitness using the included spacer, making it perfect for enhancing your AR-15. Plus, you can swap this magnifier between rifles easily with the included quick detach mount, with a ratcheting adjustment that ensures a tight, secure fit on your rail.

We recommend pairing the DELTA with our ALPHA red dot sight, for a fully featured, modern red dot and magnifier setup. You can get them as a set here, with a bundle discount to enhance your rifle, and prepare you for any shot from point blank to 500 yards or more!

Better Eye Relief and Sight Picture

• A full three inches of eye relief ensures you’ll have a clearer view of the target, even with backup iron sights installed!
• Multicoated glass gives you a more crisp view of your target, with better light transmission and definition.
• 38 foot field of view gives you a clear picture of what’s around your target, with a forgiving eyebox for head movement.

Flexibility Between Rifles

• The Quick Detach Mount is our best yet, with an audible ratcheting adjustment for tight, consistent installation.
• Switch the Delta between multiple rifles with the fast QD lever, and ensure your red dots have magnification when you need it.
• Out of the box Absolute Cowitness height – and with the Cowitness Spacer, Lower 1/3 Cowitness for even more optics compatibility.

Durable and Rugged

• Solid steel lockup in the mount keeps the magnifier secure without the need for a release button or lever.
• Rubberized shroud keeps the magnifier protected from bumps and scratches in the field.
• Durable enough to handle recoil from high caliber rifles, shotguns, and even .50 BMG. Yeah, we went there.
• For anything else, you’re covered under AT3’s Lifetime Warranty. If there’s an issue, we’ll take care of you.

Inside the box

• DELTA Red dot magnifier with QD Mount
• Cowitness Spacer
• Instruction sheet
• Lens cloth
• 3mm Allen Wrench
• Longer Screws for Spacer