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CMMG
Overview
The CMMG AR-15 Ejection Port Cover Kit is a critical component for keeping debris out of your chamber, ensuring reliable function during operation. Made from durable steel and finished in a sleek black, this cover provides both protection and a clean look to your build. It is commonly found in builds featuring a blowback gas system and chambered in 5.56 NATO, making it a practical choice for those configurations.
CMMG AR-15 Ejection Port Cover KIT was the sixth most added dust cover on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #15 of the 112 dust covers builders have added. Builds with this dust cover are split between 5.56 NATO (50%) and 9mm (50%), split between blowback (50%) and carbine-length (25%) gas systems, and mostly AR-15 (80%, then AR-9 20%).
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 8 of the 9 retailers we track have it in stock. It dipped to $8.22 at Classic Firearms for a stretch in September 2026, under its usual $8.99 to $9.54, so sales do come around. Buying today, the lowest price is $8.22 at Classic Firearms, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every dust cover by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Dust Cover Guide →The part most often added in each category by the 24 builds that include this one
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Ar-15 Ejection Port Cover Kit
| Build | Parts | Total |
|---|---|---|
 | 26 | $1842.84 |
 | 19 | $570.92 |
 | 19 | $1074.41 |
 | 16 | $921.66 |
 | 21 | $1159.81 |
 | 25 | $1042.52 |
 | 19 | $631.91 |
2 global ratings
Top reviews
CMMG ejection port cover kit drops in to a standard upper without any fitting. Comes complete with rod, spring, and c-clip preassembled. Spring tension is correct, snaps door open on bolt cycling. Solid budget cover replacement.
CMMG ejection port cover kit comes complete with rod, spring, and c-clip preassembled. Drop in install once the upper is stripped down. Spring tension correct, snaps the cover open positively on bolt cycling. Black phosphate matches mil-spec uppers.
