AR-15 Ejection Port Cover Pin — Mil-Spec Retaining Rod for Dust Cover Assembly | UPC 859819007829
Finish your upper the right way. The AR-15 Ejection Port Cover Pin (UPC 859819007829) is a mil-spec retaining rod that secures your dust cover door and spring on AR-15/M4 upper receivers. Precision-made for smooth installation and long service life, this small but essential part keeps your ejection port cover operating correctly—protecting your chamber from dust, mud, and debris between shots and during transport.
Why This Ejection Port Cover Pin
Mil-spec fit & function: Correct length and diameter for standard AR-15/M4 uppers and most aftermarket dust cover doors.
Smooth, secure assembly: Chamfered ends and consistent tolerances help the pin pass cleanly through the cover door, spring, and receiver ears for a hassle-free install.
Durable finish: Corrosion-resistant coating stands up to solvents, oil, moisture, and field abuse.
Drop-in replacement: Ideal for new builds, refurbishing worn hardware, or replacing a lost pin during maintenance.
Reliable retention: Works with the standard C-clip/E-clip or integrated retention (depending on your cover style) to keep the pin in place.
Perfect For
New AR-15 upper builds needing dependable small parts
Repair/refresh of rifles with loose, bent, or missing dust cover pins
Armorers & ranges stocking critical spares for quick turnarounds
Quick Install Guide (Best Practices)
Verify clear. Separate upper and lower; ensure the chamber is empty.
Preload the spring: Hook the spring to the cover door and give it the standard half-turn preload so the door snaps shut.
Align components: Position the door and spring between the receiver ears.
Insert the pin: Slide the ejection port cover pin from front to rear through the ear, door, spring, and rear ear.
Secure retention: Install the C-clip/E-clip (if required) into the groove and verify free movement and positive spring tension.
Pro Tip: A strip of painter’s tape around the receiver ears can prevent scuffs while you press the clip on. Work over a tray so tiny clips don’t disappear.
Compatibility Notes
Platform: AR-15 / M4 pattern uppers
Covers: Fits most standard ejection port covers (steel or polymer) and springs
Not for: AR-10/.308 pattern uppers (use the correct, longer .308 pin)
Maintenance & Reliability
Keep the hinge area lightly oiled to prevent rust and ensure smooth opening/closing.
Inspect the retaining clip during cleanings; replace if bent or missing.
If your cover doesn’t snap shut, check spring orientation and preload.
Specifications
| Attribute | Detail |
|---|
| Product | AR-15 Ejection Port Cover Pin |
| Function | Retains dust cover door & spring on AR-15 upper |
| Standard | Mil-spec dimensions |
| Material | Hardened steel (with corrosion-resistant finish) |
| Compatibility | AR-15/M4 upper receivers & standard dust covers |
| UPC | 859819007829 |
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Small part, big payoff—secure your dust cover with this mil-spec AR-15 Ejection Port Cover Pin for dependable protection against dirt and debris in any environment.
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