What is the function of the Ejection Port Cover?

• A. To cover the ejection port and protect internal components when closed
• B. To feed rounds from the magazine
• C. To adjust sights
• D. To eject spent casings

Answer: (A)

The ejection port cover is a spring-loaded door that seals the ejection port when the rifle is not cycling. Its job is to keep dust, dirt, and moisture out of the receiver, protecting the bolt carrier group and other internal parts. When the action cycles, the cover automatically opens to expose the port so the spent cartridge can be ejected; after the cycle completes, it closes again. This protective seal helps maintain reliability in dirty or wet conditions. It doesn’t feed rounds or adjust sights—the ejection is handled by the firearm’s action and ejector.