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Anyone running a blowback AR knows the drill: 9mm and .22LR uppers throw more gas and gunk back toward the receiver than a standard rifle-caliber gun does. The CMMG Ejection Port Cover Kit tackles that with a full dust cover assembly plus a polymer gas deflector, so you get cleaner running and a little less crud drifting back at your face. It's a straightforward, mil-spec-quality part from a company that has been building AR components and complete rifles for a long time.
The kit gives you all four pieces you need to build out the port: the matte black steel ejection port cover, the rod, the spring, and the black polymer gas/brass deflector. The cover ships with the detent and detent spring already installed, which saves you the fiddly part of the job. It's a drop-in replacement for your standard cover, whether you're refreshing a tired assembly or finishing a new build.
This one is aimed squarely at 9mm and .22LR platforms. Blowback guns are gassy by nature, and that's even more noticeable when you're running a suppressor, so the deflector earns its keep on suppressed pistol-caliber and rimfire setups. Lefties in particular tend to appreciate having something to steer gas and debris away from their face. Keep in mind the deflector is designed around the lower pressures of 9mm and rimfire and isn't meant for larger rifle rounds.
Installation is the same basic process as any AR dust cover, so a little patience and the right pin-punch technique go a long way. Fit can vary slightly depending on which brand of upper receiver you're running, and some builders like to test-fit the deflector before final assembly to dial in a snug, gap-free seal. Once it's set, you've got a clean-looking, functional port cover backed by CMMG's lifetime quality guarantee.
Yes. The kit comes with the port cover, rod, spring, and the polymer gas deflector, so you have all the core pieces to complete the assembly. The cover also arrives with the detent and detent spring already installed. You'll just need basic AR tools like a pin punch to put it together.
It's built for 9mm and .22LR AR platforms, where blowback operation kicks back more gas and residue. The deflector is intended to keep that gas out of the shooter's face during operation. It's not meant to be used as a brass deflector on rounds larger than 9mm, since higher pressures can damage the polymer.
It's designed as a drop-in replacement for standard AR-15 and M16 ejection port covers. That said, fit can vary a little between different receiver brands, so it's worth test-fitting the deflector before final assembly to get a snug, gap-free seal. Once dialed in, it seats cleanly and works as intended.
It is. Suppressors tend to increase blowback, and the deflector helps steer that extra gas away from the receiver area and the shooter. That makes it a popular pick for suppressed 9mm and rimfire setups, and left-handed shooters especially notice the difference.
| UPC | 815835016436 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 22BA627 |
| Product Type | Kit |
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