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CMMG Ejection Port Cover Kit, with Gas Deflector


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  1. Works great!

    Posted by CM on 19th Feb 2018

    I bought this for a 9mm AR build I'm doing that is permanently suppressed. The fit and finsh are great and the install was easy. The price was right on point as well! Anyone with basic AR knowledge could install this in a few minutes. I would recommend this if you need a gas deflector for your 9mm build.

  2. Suspect Quality Control.

    Posted by Terry on 11th Dec 2017

    After fighting to get this to install on my 9mm at upper for 20 minutes, I realized that the small end on the Ejection port spring was too short. Luckily I a spare in my parts bin. The second one was fine.

  3. Just what the doctor ordered

    Posted by KillJoyThree33 on 10th Oct 2017

    Easy install, function is 100%, no complaints at all. Plus it looks great!

  4. great product

    Posted by Unknown on 13th Feb 2017

    Great product, price and shipping was fast I was forced to order some forward assist plugs from another site since I didn't seem them on yalls page... and they didn't send me a tracking number etc. ordered the same day and they arrived 4 days after these products from 9mmar will be ordering a lot more from y'all in the future... keep up the great work
    Thank you Jason from Texas

  5. Good fit. Great price.

    Posted by Fanatak on 4th Jan 2017

    Kit installed with minimal fuss.
    Looks good. Functions as designed.
    Excellent value @ $20 shipped.
    Fits Aero Precision M4E1 upper better than expected.
    Has small amount of rotational play on the port door pin but this is mitigated by the tension spring.
    Would likely be a tighter fit on a standard forged upper due to differences in contour above ejection port.
    Overall very happy with it.

  6. JUST OK

    Posted by john on 29th Dec 2016

    Works- after fighting with it for an hour. Not sure what the issue was maybe the tiny spring under the deflector, maybe the hole was drilled in the wrong spot, maybe the deflector itself was a little misshapen; either way it took a LOT of work to line up everything and get the rod in place.

  7. Near perfect item

    Posted by David Velleux on 12th Jul 2016

    This CMMG part is perfect in every way, except one: believe it or not, it needs directions. This port cover kit is basically identical to its full size "brother," but one needs a "third hand" of some type to hold the cover firmly against the upper receiver, so the big spring does not lose tension as one pushes the rod through the gas deflector. Once I figured out what to properly do, I used a hemostat to hold the cover tight as I finished the gas deflector install. Works quite well now...

  8. Needed some work

    Posted by yarro on 10th May 2016

    Everything was good except for the deflector. The spring was broken off flush and the hole is too shallow for replacement spring I already had. I stuck a piece of rubber in it, and it works fine. Price was good so worth messing with.

  9. Best Price I've Found

    Posted by scott on 21st Mar 2016

    A Plus for Best Price on a complete assembly. This is the second 9mm port cover kit I've ordered from these guys. Thanks for a Great Deal! On the first one installed I didn't have the trouble with to hole depth as other reviewer noted, have yet to install this one....

  10. modifications nessesary ......

    Posted by andrew on 6th Mar 2015

    the hole for the retentsion spring is not deep enough. OR - the spring is too long. The compressed length of the spring verses the depth of the hole the spring seats into are not compatible. Instead of drilling the hole deeper, I chose to "create' my own with silicone. Other than that - it worked great.
    Much better price - the kit verses the stuff individually.

0.09 LBS
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