CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector Review

Let’s Dive into CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector

The CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector is a simple, yet potentially valuable, upgrade for your AR-pattern rifle, especially if you’re running a .22LR conversion or a pistol caliber build. This kit aims to address a couple of common issues, namely closing off the ejection port when using a .22 conversion and deflecting gas away from the shooter’s face, particularly when suppressed. I was intrigued by the potential for increased comfort and a cleaner-looking upper receiver, so I decided to give it a try.

I decided to purchase this kit because I’ve dedicated an older AR upper receiver to a .22LR conversion. That large opening in the ejection port always bothered me. Upon unboxing, I found the CMMG kit to be a straightforward collection of parts: the ejection port cover, the gas deflector, the spring, and the retaining rod. The initial impression was decent; the parts felt solid, although the plastic gas deflector raised a few eyebrows.

I considered other options, including standard ejection port covers and even leaving the port open. Ultimately, I chose the CMMG kit for its integrated gas deflector, hoping it would minimize gas blowback when shooting suppressed .22LR. Initially, I was cautiously optimistic, hoping it would live up to its claims and improve my shooting experience without breaking the bank.

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Real-World Testing: Putting CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector to the Test

First Use Experience

I first tested the CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector at my local outdoor shooting range. The conditions were relatively mild, with a slight breeze. Installation, while not overly complicated, did require a bit of finesse.

The most noticeable initial improvement was the visual appeal; it cleaned up the look of my dedicated .22 upper considerably. While shooting, I did perceive a slight reduction in gas blowback, though it wasn’t a night-and-day difference. I encountered a minor issue: the gas deflector felt a bit loose, confirming some user feedback I had read.

Extended Use & Reliability

After several range trips and hundreds of rounds of .22LR, the CMMG kit has held up reasonably well. There are some minor signs of wear on the plastic gas deflector from brass impacts. The ejection port cover itself functions reliably, opening and closing smoothly.

Maintenance is simple; I just wipe down the parts with a cloth after each range session. Compared to shooting with a standard ejection port cover or no cover at all, the CMMG kit offers a slightly more comfortable experience, especially when suppressed. It doesn’t completely eliminate gas blowback, but it does mitigate it to some degree.

Breaking Down the Features of CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector

Specifications

• The CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector includes a standard ejection port cover, a polymer gas deflector, a spring, and a retaining rod. The color is black, matching most AR-15 upper receivers.
• The kit is designed to be a drop-in replacement for the standard ejection port cover, offering the added benefit of a gas deflector. The specifications of the kit are important because they determine compatibility with standard AR-15 upper receivers and the effectiveness of the gas deflector.

Performance & Functionality

• The CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector performs its primary function – covering the ejection port – adequately. The gas deflector provides a marginal improvement in redirecting gas away from the shooter, especially when using a suppressor.
• The main strength is its simple design and ease of installation. The weakness lies in the somewhat loose fit of the gas deflector and the material choice (plastic) for the deflector. It meets expectations as a basic upgrade but doesn’t exceed them.

Design & Ergonomics

• The build quality is acceptable for the price point. The ejection port cover itself is made of durable metal, while the gas deflector is polymer.
• The design is straightforward and functional, though not particularly refined. The kit is relatively user-friendly, although some users may find the installation a bit fiddly.

Durability & Maintenance

• The durability of the ejection port cover is excellent, thanks to its metal construction. The gas deflector’s lifespan may be limited due to its plastic construction and exposure to brass impacts.
• Maintenance is minimal, requiring only occasional cleaning. Repair would likely involve replacing the entire kit.

Accessories and Customization Options

• The kit doesn’t come with any additional accessories beyond the necessary components for installation. There aren’t any significant customization options available for this particular kit.
• It is compatible with standard AR-15 upper receivers, allowing it to be used with a wide range of builds. However, it doesn’t integrate with any specific aftermarket accessories.

Pros and Cons of CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector

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Who Should Buy CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector?

• Perfect for: AR-15 owners with dedicated .22LR conversion uppers who want to improve the appearance and slightly reduce gas blowback. It’s also suitable for those building pistol caliber ARs, particularly 9mm builds, where gas blowback can be an issue.
• Who should skip this product? Those seeking a significant reduction in gas blowback or those prioritizing extreme durability and a perfect fit without any potential for looseness. If you expect a night-and-day difference in gas mitigation, you will likely be disappointed.
• Must-have accessories or modifications? Some users may find it helpful to use a dab of liquid gasket or similar adhesive to secure the gas deflector and eliminate any rattling.

Conclusion on CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector

The CMMG, Inc Ejection Port Cover Kit w/ Gas Deflector is a decent, budget-friendly upgrade that offers a minor improvement in gas deflection and a cleaner aesthetic for your AR-15. It’s particularly well-suited for dedicated .22LR uppers or pistol caliber builds where gas blowback is a concern. However, the plastic construction of the gas deflector and the potential for a loose fit are drawbacks to consider.

The price is justified for what it offers, which is a marginal improvement rather than a game-changing upgrade. I would personally recommend it to those looking for a simple, inexpensive way to enhance their AR-15, especially if they already have a .22 conversion. If you’re on a tight budget and bothered by the open ejection port on your .22 build, give the CMMG Ejection Port Cover Kit a try – it might just be the small, worthwhile improvement you’re looking for.