Can AR-15 rear sights co-witness with optics?

Yes. Most rear sights are compatible with red dot sights and can be configured to co-witness at absolute or lower 1/3 height using appropriate mounts.

Are these rear sights compatible with any AR-15?

Yes. All sights on this page mount directly to MIL-STD-1913 Picatinny rails, making them compatible with nearly all AR-15 upper receivers.

What is the difference between M4 and HK-style rear sights?

M4-style sights offer a traditional notch post setup, while HK-style rear sights use a hooded ring for faster sight alignment and additional protection.

Do you carry night-ready rear sights?

Yes. We carry Tritium-equipped rear sights that glow in the dark and are ideal for defensive or low-light applications without the need for batteries.

AR-15 Rear Sight | Flip-Up & Fixed Rear Sights for AR Rifles

Fixed Rear Sight

A2 Rear Sight

**A.R.M.S. #40 Flip Up Rear Sight** $160.00

A.R.M.S. #40L Rear Sight - Low Profile Flip UP Sight $170.00

A.R.M.S. #40L-P Low Profile Sight (500-600 meter) $180.00

**A.R.M.S. #71L Flip Up Sights (Front and Rear Set)** $144.00

**A.R.M.S. #71L series, Rear Sight** $90.00

**Aim Sports Rear Flip Up AR-15 Diopter Sights** $24.95

**Dueck Defense RTS Front & Rear Rapid Transition 45 Degree Iron Sights** $219.95

**Magpul MBUS Set (Front & Rear) - GEN 2 with Free MSP Silicone Gun Cloth** $88.35

**Magpul MBUS Pro Sight – Rear** $109.20

**Magpul MBUS Pro Set - Magpul Back-Up AR-15 Sight Set - Front & Rear w/ Free MSP Silicone Gun Cloth** $180.40

**Samson AR15 Fixed Sights - Front & Rear Package with HK Front/A2 or SP Rear** $111.58

**Samson Quick Flip Front & Rear AR Sight Package** $185.25

**Aim Sports AR-15 Rear Flip-Up Sight** $23.75

VISM High Profile AR-15 Flip Up Sights - Front And Rear Sight Set $36.95

VISM Low Profile AR-15 Flip Up Sights - Front And Rear Sight Set $36.99

**Yankee Hill AR-15 Flip Up Rear Sight** $110.84

**GG&G AR-15 45 Degree Iron Sights** $126.87

**Samson Gas Block Height Quick Flip Front & Rear Sight Package** $190.81

**Samson Manual AR Folding Rear Sight** $107.64

**Samson Quick Flip AR Rear Sight** $107.64

**Midwest Industries Combat Rifle Rear Sight** $91.87

AR-15 Rear Sights – Precision Alignment for Every Rifle Build

When it comes to consistent accuracy and tactical readiness, a quality AR-15 rear sight is essential. Whether you're running irons as your primary aiming system or need a reliable backup for your optic, Mounts Plus offers a complete selection of rear sights to suit any shooting style.

Choose from low-profile folding sights, durable fixed sights, rapid-deploy flip-ups, and night-ready tritium options—all from top manufacturers like Troy Industries, Magpul, Midwest Industries, Samson, and more. Every sight we carry is Picatinny-compatible and battle-tested for performance in competitive, defensive, and recreational settings.

✅ Why Choose an AR-15 Rear Sight from Mounts Plus?

🎯 Folding, Fixed & Low-Profile Options – For every optic setup or backup need
🔧 Fits All MIL-STD-1913 Picatinny Rails – Easy installation on any AR upper
🔍 Co-Witness Ready – Compatible with absolute and lower 1/3 red dot setups
🌒 Tritium & Night Sight Models – Self-illuminating for low-light engagements
🔩 Built to Last – Rugged aluminum, stainless steel, and polymer options
🚀 Fast U.S. Shipping – All items ship quickly from our Florida warehouse

📦 Our Most Popular AR-15 Rear Sights

Product Name	Type	Highlights	Brand
Troy Folding Rear Sight	Flip-Up	Low-profile, zero-retaining	Troy Industries
Magpul MBUS Pro Rear Sight	Flip-Up	All-steel, compact, durable	Magpul
Samson Manual Folding Rear Sight	Flip-Up	Quick-deploy, rugged construction	Samson Mfg.
Midwest Industries Combat Rear Sight	Fixed	Tool-less adjustment, battle-ready	Midwest Industries
Aim Sports Diopter Rear Flip Sight	Budget Flip-Up	Affordable, easy to install	Aim Sports

✔️ Available in black or FDE
✔️ Choose from standard or offset configurations
✔️ Perfect for training, competition, or duty rifles

💬 FAQs – Choosing the Right AR-15 Rear Sight

Q: What is the best AR-15 rear sight for backup use?
A: Flip-up rear sights are ideal backups when using a red dot or scope. They stay out of the way until needed and hold zero reliably.

Q: Can rear sights co-witness with optics?
A: Yes. With the right optic height or riser, you can co-witness your rear sight in absolute or lower 1/3 alignment with your red dot.

Q: Do I need a special tool to install my rear sight?
A: Most rear sights attach directly to any Picatinny rail and require only basic tools, often just a flathead or hex wrench.

Q: What’s the difference between M4 and HK-style sights?
A: M4-style uses a squared post and traditional notch, while HK-style features a circular hood around the aperture for faster alignment and protection.

Q: Are there rear sights that glow in the dark?
A: Yes. Tritium-equipped rear sights provide glowing alignment points without batteries—ideal for low-light shooting.

🔗 Related Categories

🚚 Why Buy From Mounts Plus?

✅ 25+ Years Serving Shooters
🔒 Secure, Hassle-Free Checkout
📞 Expert Support From Real Shooters
🇺🇸 Proudly U.S.-Based & Veteran-Owned

🛒 Upgrade Your Accuracy with an AR-15 Rear Sight

Whether you're training at the range or prepping your rifle for serious use, a dependable AR-15 rear sight ensures faster, more accurate target acquisition. Explore our full collection and find the rear sight that completes your build.

👉 Shop now at Mounts Plus – built to perform, ready to ship.

AR-15 Rear Sight | Flip-Up & Fixed Rear Sights for AR Rifles | Mounts Plus