The ERGO AR-15 Upper Receiver Spring Replacement Kit (brand part no. 4611) bundles the five small springs most likely to wear out or weaken on an AR-15 upper receiver into one convenient kit. Instead of ordering each spring individually or guessing which one is causing a malfunction, you get the ejector spring, forward assist spring, port cover spring, extractor spring, and extractor spring buffer in a single package. Replacing all five at once during a routine maintenance session is a cheap way to head off failures to eject or extract before they happen on the range or in the field. It’s a practical kit for anyone doing preventive maintenance on an AR-15 upper.

Key Specifications

• Ejector spring keeps spent casings ejecting cleanly from the receiver.
• Forward assist spring returns the forward assist plunger after use.
• Port cover spring keeps the dust cover closed when the rifle isn’t cycling.
• Extractor spring maintains extractor tension for reliable case extraction.
• Extractor spring buffer cushions the extractor spring for consistent pressure over time.
• 5-piece kit format covers the most common upper-receiver spring replacements in one order.

Frequently Asked Questions

What springs are included in this kit? The ejector, forward assist, port cover, and extractor springs, plus the extractor spring buffer.

Why replace these springs? Worn springs in these positions can cause failures to eject, extract, or return to battery.

Buy the ERGO AR-15 Upper Receiver Spring Replacement Kit, 5-Piece

Refresh your upper’s small parts with this Ergo kit from our small AR-15 parts selection. Order it from our Lubbock, Texas gun shop for fast, direct shipping right to your door.