Yankee Hill Machine Ejection Port Cover Assembly AR-15 Caliber Engraved Aluminum Black

The Yankee Hill Machine AR-15 ejection port cover assembly keeps dust and debris out of your upper receiver while giving you a practical way to track caliber changes. Unlike generic dust covers, these Yankee Hill assemblies come engraved with caliber markings—a smart solution if you're running multiple uppers in different calibers or planning to swap barrels down the road. The black anodized aluminum construction is durable enough for serious use, and the assembly includes everything you need to install and operate it right out of the box.

Yankee Hill Machine built this product from real-world experience: they've been marking uppers for years, and realized shooters often need to identify which cover goes with which caliber. The engraved dust cover answers that problem directly. It's a small detail that matters when your gun room grows or when you're swapping configurations at the bench.

If you're building or maintaining an AR platform rifle, this cover protects your receiver and helps you stay organized. Installation is straightforward, and the spring-loaded design keeps the cover secure whether your gun is in action or in the safe.

Key Features

• Caliber-marked engraved aluminum construction for easy identification
• Black anodized finish resists corrosion and wear
• Spring-loaded assembly for positive retention
• Fits standard AR-15 ejection port
• All components included for immediate installation

Specifications

Frequently Asked Questions

Will this AR-15 ejection port cover fit my upper receiver?

This assembly is designed for standard AR-15 ejection ports. Confirm your upper is a standard AR-15 platform before ordering.

What calibers are available?

The cover is engraved with a caliber marking, but the specific caliber options available depend on current inventory. Contact Bosque Outdoors for current caliber availability.

Does this come fully assembled?

Yes. The assembly includes the caliber-marked dust cover, rod, retaining clip, and spring. Everything needed for installation is included.

Can I use this if I swap calibers between uppers?

Absolutely. That's exactly why Yankee Hill Machine created these engraved covers—so you can quickly identify which upper or dust cover matches which caliber if you're running multiple configurations.