Install Ejection Port Cover Assembly on Upper Receiver

AR-15 Ejection Port Assembly

This assembly consists of:

Ejection Port Cover

Ejection Port Cover Pin

Ejection Port Cover Spring

Ejection Port Cover Pin Snap Ring (Not needed for the Bootleg Upper Receiver)

Upper Receiver

1.AR-15 Ejection Port Cover Pin Snap Ring and Ejection Port Cover Pin

Carefully place ejection port cover pin snap ring in the groove on the end of the ejection Port Cover Pin.

2.AR-15 Ejection Port Cover Pin Snap Ring and Ejection Port Cover Pin

Gently hammer ejection port cover pin snap ring the rest of the way onto the ejection port cover pin. Be sure to make a direct, downward strike on the snap ring. If you hit it off center, the ejection port cover pin snap ring may fly across the room. This is also a good time to check and make sure your safety glasses are still on.

3.AR-15 Upper Receiver

Lay the AR 15 upper receiver on its side so the ejection port is facing up and the Barrel Threads are pointing to the right as you stand over the upper receiver. Barely start the ejection cover pin so it stays in place on its own, making sure the end without the snap ring is started first.

4.Ejection Port Cover Pin and AR-15 Upper Receiver

Place the ejection port cover on the upper receiver in the open position, make sure the holes in ejection port cover are lined up with the holes on the upper receiver.

5.AR-15 Upper

Slide the ejection port cover pin through the hole in the upper receiver that is closest to the barrel threads, stopping just before the pin emerges in the middle opening of the ejection port cover (this is where the ejection port cover spring goes).

6.AR-15 Ejection Port Cover Spring

While holding the ejection port cover spring in your left hand (by the end with the short part of the spring sticking out), grab the long part of the spring that sticks out and wind it 1/2 revolution away from your body, stopping when the long part of the spring is pointing toward you.

7.AR-15 Upper Receiver

As you hold the spring under tension, place the long end on the right side of the ejection port cover (closest to the ejection port cover pin that is part way through the assembly), while still holding on with your left hand, and slide the ejection port cover pin the rest of the way through, until the ejection port cover pin snap ring stops your progress.

8.AR-15 Upper Receiver

Close the ejection Port Cover, making sure it snaps shut.

9.AR-15 Upper Receiver

Reach inside the upper receiver and push the ejection port cover, making sure it snaps open.

Ejection Port Assembly is now installed.

2 thoughts on “Install Ejection Port Cover Assembly on Upper Receiver”

  1. I’m getting close to assembling my bootleg upper. This instruction says you don’t need the snap ring. Yet it gives you instructions on using the snap ring for port door assembly. It’s very confusing especially to a novice, I’ll just wing it and get it right from experience.

    I suggest making a You Tube video

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