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A dust cover is one of those small parts you never think about until it stops snapping shut the way it should. This CMMG kit is the fix for large-frame 308/7.62 builds, giving you the full ejection port cover assembly instead of hunting down loose springs and rods that may or may not line up. It's built specifically for the bigger footprint of a .308 receiver, so you're not trying to force an AR-15 sized part into a spot it was never made for.
The kit ships with the Mk3 ejection port cover, the rod, and the spring in a black finish. That's the whole moving assembly you need to get the door swinging and latching again. It's a genuine CMMG part, so the geometry matches their Mk3 uppers along with other common AR-10 and LR-308 pattern receivers, which takes a lot of the guesswork out of fitment.
This is a large-frame .308 part, plain and simple. It's aimed at CMMG Mk3 rifles and pistols but plays nicely with DPMS-pattern 308 uppers that use the same ejection port dimensions. If you're building up a stripped upper or bringing an older rifle back to life, having the cover, rod, and spring matched from the factory means less fiddling to get everything to close cleanly with no binding.
Installation is straightforward for anyone comfortable working on their own upper. You'll seat the rod through the cover's hinge loop, get the spring tensioned, and lock it in place with a clip. A little patience and a punch or small pick makes the job go smooth, and once it's in, you've got proper protection keeping grit and debris out of your action while the rifle's slung or stored.
It's designed for CMMG Mk3 rifles and pistols chambered in 308/7.62. Because it uses the standard large-frame port dimensions, it also works on many AR-10 and LR-308 DPMS-pattern uppers. It is not sized for AR-15 receivers, so keep it on your .308 builds.
The kit includes all three pieces: the ejection port cover, the rod, and the spring. That's the full moving assembly, so you won't need to source loose parts separately to get the door working again.
It's a manageable job for anyone who does their own upper work. You slide the rod through the cover's hinge, get the spring tensioned, and secure it with a clip. A punch or small pick and a little patience is really all it takes.
A .308 receiver has a bigger ejection port than a 5.56 build, so an AR-15 cover won't seat or close correctly. This CMMG kit is sized for that larger opening, which is why it latches cleanly on Mk3 and other 308 platform uppers.
| UPC | 815835016429 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 38BA538 |
| Model | |
| Product Type | Ejection Port Kit |
| Shipping Weight | 0.065 |
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