The ERGO AR-15 upper receiver spring replacement kit includes 5 important springs that are commonly replaced or easily lost when building a stripped AR-15 upper receiver. The 5-piece kit includes an ejector spring, forward assist spring, dust cover spring, extractor spring and black extractor spring buffer. Kit Includes: 1 x Ejector Spring1 x Forward Assist Spring1 x Ejection Port Cover Spring1 x Extractor Spring1 x Extractor Spring Buffer