AR-15 MK3 Ejection Port Cover KIT
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CMMG
Overview
The CMMG AR-15 Mk3 Ejection Port Cover Kit is a durable component designed to keep your firearm's action clean and free from debris by covering the ejection port when not in use. Made from steel, this black dust cover provides reliable performance and protection, ensuring that your rifle functions smoothly in various conditions. This part is commonly found in builds featuring a mid-length gas system and chambered in .223 Wylde, making it a practical choice for those configurations.
Specifications
Build history on GunPartPicker
Builders on GunPartPicker first added the CMMG AR-15 MK3 Ejection Port Cover KIT to a build in March 2026.
It was in stock most days in August 2026, and today 4 of the 7 retailers we track have it in stock. It dipped to $9.99 at Optics Planet for a stretch in August 2026, well under its usual $13.99 to $14.31, so sales do come around. Buying today, the lowest price is $14.12 at Classic Firearms, above August's low of $9.99, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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Read the guide: AR-15 Dust Cover Guide →Frequently Built With
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Builds Featuring This Part
See all 1 →Builds in the community that include the Ar-15 Mk3 Ejection Port Cover Kit
| Build | Parts | Total |
|---|---|---|
 | 22 | $1378.55 |
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