45 Degree Flip Up BUIS | Offset AR-15 Backup Iron Sights

Q: What are 45 degree flip up BUIS used for?

45 degree flip up BUIS are backup iron sights for rifles with optics. Mounted at an angle, they allow shooters to quickly switch to irons if their optic fails.

Q: Are 45 degree flip up sights accurate?

Yes. When properly installed and zeroed, 45 degree flip up BUIS are accurate and dependable for close to mid-range shooting.

Q: Do 45 degree flip up sights fit all AR-15 rifles?

Most 45 degree flip up BUIS mount to standard Picatinny rails, making them widely compatible with AR-15 rifles and other modern sporting platforms.

Q: What’s the difference between flip up and fixed offset BUIS?

Flip-up BUIS fold down when not in use, keeping a low profile, while fixed BUIS remain deployed at all times and are always ready.

Q: Are 45 degree sights good with optics?

Yes. 45 degree flip up sights are commonly paired with red dots, LPVOs, and magnified scopes, providing a fast and reliable backup sighting option.

**UTG ACCU-SYNC MT-745 | Offset Front Flip-up BUIS for AR-15** $42.36

**UTG ACCU-SYNC MT-945 | Offset Rear Flip-up BUIS for AR-15** $42.36

**Strike Industries Sidewinder II - Black Offset & Inline BUIS** $176.95

**TROY 45° Offset BattleSight Set | Black – HK Front & Round Rear** $228.05

**TROY 45° Offset BattleSight Set | FDE (Flat Dark Earth) – HK Front & Round Rear** $228.05

**TROY 45° Offset BattleSight Set | Black – M4 Front & Dioptic Rear** $228.05

**Magpul MBUS Pro Offset Sight Front** $85.45

**Magpul MBUS Pro Offset Sight Rear** $104.45

When you’re running optics on your AR-15, you still need a dependable backup. That’s why 45 Degree Flip Up BUIS (Backup Iron Sights) are a go-to solution for tactical shooters, competitors, and rifle enthusiasts. Mounted at an angle, these offset sights let you quickly tilt your rifle and transition to irons in seconds — no tools, no downtime.

At Mounts Plus, we offer a wide selection of 45 degree flip up iron sights designed for AR-15 and other modern sporting rifles. From budget-friendly models to rugged, combat-ready BUIS, our collection gives you reliability and versatility when you need it most.

Why Choose 45 Degree Flip Up BUIS?

Fast Backup Access: Instantly switch from optics to iron sights by canting your rifle.
Space-Saving Design: Flip-up construction keeps sights out of the way until needed.
Perfect With Optics: Ideal for rifles with scopes, red dots, or LPVOs.
Low-Profile Fit: Slim and lightweight so they don’t clutter your rail.
Universal Compatibility: Works with most AR-15 rifles using Picatinny rails.

Types of 45 Degree Flip Up Sights We Carry

Flip-Up Offset BUIS: Deploy only when needed, fold down for a clean profile.
Fixed Offset Sights: Always ready, no deployment needed.
Adjustable Models: Tool-less windage and elevation adjustments on premium versions.
Polymer vs. Metal: Choose between lightweight polymer or rugged aluminum and steel designs.

Choosing the Best 45 Degree Offset BUIS for AR-15

When selecting 45 degree flip up sights for AR-15, consider:

Use Case: Competition, tactical, or range use.
Durability: Steel and aluminum for heavy use, polymer for lightweight builds.
Deployment: Flip-up for low profile, fixed for instant readiness.
Budget: Entry-level to premium combat-tested brands.

Mounts Plus carries top names in BUIS, including Strike Industries, Magpul, UTG, and Troy — so you can be confident in both performance and quality.

✅ Frequently Asked Questions (FAQ)

Q: What are 45 degree flip up BUIS used for?
A: They serve as backup iron sights for rifles with optics. Mounted at an angle, they let you switch quickly to irons if your primary optic fails.

Q: Are 45 degree flip up sights accurate?
A: Yes. When properly zeroed, 45 degree flip up BUIS are accurate for close to mid-range shooting and provide reliable performance.

Q: Do 45 degree flip up sights fit all AR-15 rifles?
A: Most mount to standard Picatinny rails, making them compatible with AR-15 and other modern sporting rifles.

Q: What’s the difference between flip up and fixed offset BUIS?
A: Flip-up sights fold down when not in use, while fixed sights are always deployed. Flip-up models are more compact, while fixed sights offer instant readiness.

Q: Are 45 degree sights good with optics?
A: Yes. They pair perfectly with red dots, magnified optics, or LPVOs, giving you a reliable backup option.

🔗 Shop 45 Degree Flip Up BUIS at Mounts Plus

Upgrade your rifle with the best 45 Degree Flip Up BUIS available. From offset flip up AR-15 sights to rugged fixed BUIS, Mounts Plus has the right backup solution for your build. Shop now and get reliable performance when it matters most.