Are AR-15 dust covers universal?

Most AR-15 dust covers are compatible with mil-spec upper receivers. Some billet or custom uppers may require specific fits.

What’s the difference between billet and mil-spec dust covers?

Billet covers are CNC-machined and offer enhanced aesthetics and strength. Mil-spec covers are stamped steel and offer basic durability at a lower cost.

Can I install an AR-15 dust cover myself?

Yes. Most dust covers can be installed in 5–10 minutes using basic hand tools. Some kits include all necessary parts.

Do you carry caliber-marked dust covers?

Yes. Mounts Plus stocks engraved AR-15 dust covers marked for 300 Blackout, 9mm, and more.

AR-15 Dust Covers – Mil-Spec, Billet & Custom Ejection Port Doors

Name: AR-15 Dust Covers
Brand: Mounts Plus
Availability: InStock

Billet Dust Cover

**Aim Sports Ejection Port Dust Cover Assembly for AR-15/M4 Mil-Spec Rifles** $6.95

**Timber Creek Outdoors Billet AR-15 Dust Cover** $23.95

**Timber Creek Outdoors Upper Parts Kit** $143.99

**Timber Creek Greyman Billet Dust Cover - AR15 Dust Cover** $33.95

**DELTAC Ejection Port Cover kit for AR-15 (Made in USA)** $14.95

**Yankee Hill AR15 Dust Cover - 300 Blackout Caliber Marked** $18.30

**Yankee Hill AR15 Dust Cover - 5.56 Caliber Marked** $18.30

**Yankee Hill AR15 Dust Cover - 9mm Caliber Marked** $18.30

**UTG Quick Install AR-15 Dust Cover, .223/5.56** $10.90

AR-15 Dust Covers – Mil-Spec & Custom Ejection Port Covers

Your AR-15 dust cover, also known as the ejection port cover, plays a crucial role in protecting your rifle's internals from dust, dirt, and carbon buildup. Whether you're building from scratch or upgrading a factory upper, the right dust cover can increase reliability, performance, and durability in harsh conditions.

At Mounts Plus, we offer a handpicked selection of mil-spec, billet, and custom AR-15 dust covers, including engraved and caliber-marked options for 300 Blackout, 5.56, and 9mm setups.

Top AR-15 Ejection Port Covers We Carry

Product Name	Type	Caliber
Aim Sports Ejection Port Dust Cover Assembly	Mil-Spec	Universal AR-15
Timber Creek Outdoors Billet AR-15 Dust Cover	Billet	Universal AR-15
Yankee Hill AR15 Dust Cover – 300 Blackout Marked	Engraved Steel	.300 BLK
DELTAC Ejection Port Cover Kit – Made in USA	Standard Kit	AR-15
Yankee Hill AR15 Dust Cover – 9mm Marked	Engraved Steel	9mm
Timber Creek Outdoors Greyman Billet Dust Cover	Billet	AR-15

✅ Fits all standard AR-15 upper receivers
✅ Includes pin, spring, and installation components (varies by model)
✅ Available in black anodized, FDE, stainless, or engraved finishes
✅ Built from 7075-T6 aluminum or high-strength steel

🔧 Why Upgrade Your AR-15 Dust Cover?

✔️ Protects Your Rifle – Blocks dust, dirt, carbon, and moisture from entering the upper
✔️ Reduces Malfunctions – Prevents carbon fouling and debris-induced failures
✔️ Improves Appearance – Choose from custom laser-engraved or color-matched covers
✔️ Quick to Install – Most kits come with pins, springs, and hardware
✔️ Compatible with Mil-Spec & Custom Builds – Perfect for builds chambered in 5.56, .300 BLK, or 9mm

Whether you're building a precision rifle or a rugged SHTF carbine, your dust cover is your first line of internal defense.

🧠 Choosing the Best Ejection Port Cover for Your AR-15

Cover Type	Best For	Notes
Mil-Spec	Reliability, budget builds	Simple, tested, easy to install
Billet	Custom builds, enhanced fit and finish	Stronger and sleeker than stamped steel
Engraved / Marked	Personalized or caliber-specific setups	Includes 300 BLK, 9mm, custom logos
Parts Kits	DIY builders and armorers	Includes cover, rod, c-clip, spring

🧰 Installation Tips

Tools Needed: Small punch or flathead, pliers, optional roll pin tool
Time to Install: ~5–10 minutes
Steps:
1. Remove old pin and spring
2. Insert new spring and rod through the receiver
3. Snap into place and test the door spring tension
Lubricate lightly and inspect for proper seating

💡 Want a guide? Check our upcoming video on “How to Install an AR-15 Dust Cover in Under 5 Minutes.”

❓ Frequently Asked Questions

Q: What is the purpose of an AR-15 dust cover?
A: It protects the ejection port from debris, helping prevent malfunctions and internal wear during use or storage.

Q: Is the AR-15 dust cover universal?
A: Most covers are compatible with Mil-Spec AR-15 upper receivers, but billet receivers may require specific models.

Q: What's the difference between billet and stamped covers?
A: Billet covers are CNC-machined and offer tighter tolerances and visual upgrades. Stamped covers are budget-friendly and mil-spec compliant.

Q: Can I install a dust cover without a vise or gunsmithing tools?
A: Yes. Many covers come with drop-in pins and springs and can be installed with basic hand tools.

Q: Do you carry caliber-marked ejection port covers?
A: Yes. We stock 300 BLK, 9mm, and other engraved options from brands like Yankee Hill and Timber Creek.

🛒 Why Buy AR-15 Dust Covers at Mounts Plus?

✔️ Wide selection of mil-spec and custom-fit ejection port covers
✔️ Top brands: Timber Creek, DELTAC, Yankee Hill, Aim Sports
✔️ Competitive pricing on all AR-15 components
✔️ Fast shipping from our U.S. warehouse
✔️ Veteran-owned & trusted since 1994

🚀 Protect Your Rifle & Personalize Your Build

Don't overlook one of the smallest but most critical parts of your AR-15. A dust cover helps ensure clean operation and long-term performance. Whether you want rugged functionality or a custom finish, we’ve got the cover to match your build.

➡️ Shop AR-15 Dust Covers Now
➡️ Durable, stylish, and mission-ready