AR-15 Flip-Up Sights – Durable BUIS for Tactical, Range & Backup Use

Whether you're building out your first AR-15 or upgrading your optic system, a reliable set of flip-up sights is a must. These backup iron sights (BUIS) give you fast deployment, repeatable accuracy, and peace of mind if your red dot or optic goes down.

At Mounts Plus, we carry a carefully selected lineup of AR-15 folding sights that mount to standard Picatinny rails — tough enough for duty rifles, light enough for any build. From polymer budget sets to all-steel pro-grade options, we’ve got your front and rear covered.

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🔧 Why Use Flip-Up Sights on Your AR-15?

Flip-up sights are a versatile backup solution for AR-15s that run red dots or LPVOs. They fold down to stay out of the way when not in use and deploy instantly when you need them. Top benefits include:

• Fast target acquisition with co-witness or offset configurations
• Lightweight and compact — stays low until needed
• Compatible with any flat-top AR-15 upper with a standard Picatinny rail
• No batteries or electronics — works when optics fail

Whether you’re at the range, on patrol, or relying on your rifle for defense, these sights give you reliable redundancy.

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🔭 Our Best Flip-Up Sights for AR-15 Rifles

We offer front and rear folding sights from trusted names like Magpul, Troy Industries, Samson, and UTG, including:

Magpul MBUS GEN 2

• Polymer construction, spring-loaded deployment
• Affordable, lightweight, and field-proven
• Available as front, rear, or sight set

Magpul MBUS Pro

• All-metal design with low-profile build
• Excellent for hard-use rifles and patrol carbines
• Available in offset and standard versions

Troy Folding Battle Sights

• Trusted by military and law enforcement
• Robust, precise, and rock-solid when deployed
• Made in the USA

Samson Flip-Up Sights

• HK-style and A2-style options
• Machined from aircraft-grade aluminum
• Manual deployment, ultra-durable locking

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🧲 Front, Rear & Complete Flip-Up Sight Sets

You can shop:

• Front sights only — to pair with a fixed rear or LPVO
• Rear sights only — if your front is already mounted
• Matched sets — for complete backup coverage

All products are compatible with standard Picatinny rails and designed to line up for proper zero — just make sure front and rear are mounted on rails of equal height.

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🛠️ Which Flip-Up Sight Is Right for You?

Choosing the best BUIS depends on:

• Use case – Range, tactical, competition, home defense

• Material – Polymer for lightweight builds, steel/aluminum for rugged use

• Mounting – Standard or offset (45-degree)

• Budget – We offer quality sights from $25 to premium sets over $150

Still unsure? Our support team is happy to guide you based on your AR setup and shooting style.

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💬 FAQ – AR-15 Flip-Up Sights

Q: Are flip-up sights necessary if I have a red dot?
A: Yes. If your optic fails due to battery loss, fogging, or damage, flip-up BUIS provide instant backup. They’re a smart addition to any serious AR build.

Q: Can I co-witness flip-up sights with a red dot?
A: Absolutely. Most flip-up sights can co-witness through a red dot at absolute or lower 1/3 height, depending on your optic mount.

Q: What's the difference between polymer and steel sights?
A: Polymer sights are lighter and cost-effective — ideal for casual range use. Steel or aluminum sights offer greater durability for tactical or high-round-count rifles.

Q: Will these sights fit on any AR-15?
A: Yes, as long as your upper has a standard Picatinny (1913) rail. Some free-float handguards may require height-matched front sights if the rail is lower than the upper receiver.

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🛒 Shop AR-15 Flip-Up Sights at Mounts Plus

Ready to add confidence to your AR setup? Whether you're buying your first iron sights or upgrading to a duty-grade set, Mounts Plus has the folding AR-15 sights you can trust. Fast shipping, competitive prices, and expert support — order today and shoot with confidence.