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The ejection port cover is one of those small parts nobody thinks about until it's missing or broken, and then it's all you can think about. CMMG's Ejection Port Cover Kit gives you a complete, ready-to-install assembly for AR-15 pistols and rifles that meets or exceeds mil-spec. Machined from 6061-T6 aluminum with a black finish, it snaps open under spring tension so fired brass clears the way, then latches closed to keep dust, grit, and debris out of your action when the rifle is at rest. It fits standard AR-15, M16, and M4 style upper receivers.
This is a full kit, not just the door by itself. You get the ejection port cover, the hinge rod, the spring, and the little c-clip that holds it all together. That's the whole assembly, which matters because those tiny parts have a habit of vanishing into the carpet during a build. Having them all in one package means you're not hunting for a replacement spring or clip halfway through the job.
If you've built an upper before, you already know this part can be fiddly, and if you haven't, a little patience goes a long way. The rod passes through the front hole of the upper, through one half of the cover, through the twisted spring, then the other half of the cover, and out the rear. The spring needs to be rotated to load tension before you seat it, so a slave pin or even a trimmed toothpick can help hold everything in place while you drive the real rod through. Note that on most uppers the cover has to go in with the barrel and handguard off, so plan repairs accordingly.
CMMG has a solid reputation in the AR world, and folks who've run this kit tend to point to clean fit and finish that drops in without needing to be filed or fussed with. It's a straightforward, no-drama part from a name people trust for build components.
The kit comes with everything needed to complete the assembly: the ejection port cover, the hinge rod, the spring, and the c-clip. Because those small pieces are easy to lose during a build, getting them all together saves you a headache. It's ready to install straight out of the package.
Yes, it's designed for standard AR-15, M16, and M4 style upper receivers and fits both rifles and pistols built on that platform. It meets or exceeds mil-spec dimensions, so it drops into a standard-spec upper. If your upper takes a normal USGI-pattern port cover, this one will work.
It has a reputation for being one of the trickier steps in an upper build, mostly because of loading spring tension and seating the c-clip in a tight space. Twisting the spring before you seat it and using a slave pin to hold parts in place makes it much easier. On most uppers the cover installs with the barrel and handguard removed, so it's simplest to do during assembly.
This CMMG kit uses a 6061-T6 aluminum cover with a black finish. That's a durable, corrosion-resistant material that holds up well to repeated opening and closing over the life of the rifle. It carries CMMG's Lifetime Quality Guarantee.
| UPC | 815835016412 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55BA6E3 |
| Color | EJECTION PORT COVER KIT |
| Length | 4.6000 |
| Model | |
| Product Type | Dust Cover |
| Shipping Weight | 0.065 |
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