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If you run more than one AR upper, you already know the headache of trying to remember which one is chambered for what. Yankee Hill Machine's answer is refreshingly simple: a dust cover with the caliber laser-engraved right on the face. This one is marked .300 AAC Blackout, so a quick glance at the ejection port tells you exactly what that build feeds on before you ever grab a magazine.
The whole idea came from YHM's history building caliber-marked upper receivers. Folks kept asking what happens when they want to swap the caliber on a top end, and the marked dust cover was the tidy fix. For anyone who keeps a 5.56, a 7.62×39, and a .300 BLK upper on the same lower, this takes the confusion out of the equation and cuts down the chance of chambering the wrong round. That kind of clarity matters most on the range when you're moving fast between setups.
This is sold as a full assembly, not just the door. You get the caliber-marked cover along with the rod, retaining clip, and spring, which is everything needed to complete the install. It follows standard AR-15 accessory dimensions and fits standard AR upper receivers, so it drops in the same way a factory dust cover does. If you've swapped one before, you'll be done in a few minutes with basic hand tools.
The dust cover itself is steel with a black finish, so it holds up to the same abuse as the rest of your upper. Beyond identification, it does the original job of any ejection port cover: keeping dust, dirt, and moisture out of the receiver when the rifle is closed up and stored or slung. It pops open on the first shot like any spring-loaded cover, so there's nothing extra to think about once it's on. Practical, durable, and built for the .300 Blackout crowd who likes their gear organized.
Yes, it's built to standard AR-15 accessory dimensions and fits standard AR-pattern upper receivers. It installs the same way as a factory dust cover, so if your upper takes a mil-spec ejection port door, this one will drop right in. Just confirm you have a standard AR-style receiver before ordering.
It does. The assembly includes the caliber-marked cover, the rod, the retaining clip, and the spring, which is the complete package for a drop-in install. You'll only need basic hand tools to get it mounted.
No. The caliber marking is purely for identification, so nothing about the part changes how your rifle functions. That said, it's meant to label a .300 AAC Blackout build, so it works best when it matches the actual caliber of your upper and keeps the wrong ammo out of the wrong gun.
If you own multiple AR uppers in different calibers, a marked cover tells you at a glance which build takes which round. That's a real safety and convenience win when you're swapping uppers or grabbing ammo quickly at the range. It's a cheap, simple way to stay organized.
| UPC | 816701017717 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | YHM-111-300 |
| Caliber/Gauge | .300 AAC Blackout |
| Color | Black |
| Length | 4.8000 |
| Product Type | Dust Cover |
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