Every single spring you'll need for an AR-15/M4. Made in USA.

Includes:

Barrel:
Spring, Front Sight Detent

Upper:
Spring, Selector Detent & Ejector
Spring (NO Buffer), Extractor
Spring, Forward Assist
Spring, Forward Assist Pawl
Spring, Ejection Port Cover
Spring, Slip Ring (Weld Spring)

Lower:
Spring, Buffer Retainer Detent
Spring, Disconnector
Spring, Trigger
Spring, Hammer
Spring, Bolt Catch Plunger
Spring, Selector Detent & Ejector
Spring, Magazine Catch
Spring, Takedown/Receiver Pivot Pin x2
Spring, Trigger Guard Detent