AR15 Ejection Port Cover Spring

AR-15 Dust Cover Spring

The ejection port cover, often called the dust cover, is the hinged flap on the right side of an AR-15 upper receiver that keeps dirt and debris out of the action. This small torsion spring from United Defense is what flips that cover open when the bolt carrier moves, and it holds the cover against the receiver once it opens. If your cover hangs limp, no longer snaps open, or the old spring went missing during a cleaning, this is the replacement part.

Features

• Torsion Spring Design — The tightly wound coil stores energy as it twists, so the cover springs open as soon as the bolt carrier releases it.
• Two Bent Legs — A short leg at one end and a longer leg at the other bear against the cover and the receiver to set the spring's tension.
• Black Finish — The wire carries a dark black finish that matches the rest of a typical AR-15 upper.
• Close-Wound Coils — The coils sit tight against each other along the full body for a compact fit over the hinge pin.
• AR-15 Pattern Part — Made for the standard AR-15 ejection port cover assembly found on most uppers of this pattern.
• Direct Replacement — It slides over the existing hinge pin in the same position as the original spring, so you keep your current cover and pin.
• Useful Spare — This spring is small and easy to lose during disassembly, which makes it worth keeping one in a parts kit.

Fit And Installation

The spring sits inside the hinge of the ejection port cover, with the hinge pin passing through the center of the coil. During assembly the spring is wound against its legs to put it under tension before the pin is pushed home. The listing covers the spring alone, so plan to reuse your existing ejection port cover and hinge pin.