The DPMS AR-15 Spring Kit replaces the springs that wear out first on a .223/5.56 AR-15. It covers the upper receiver, lower receiver, bolt and sights in one package, so you can refresh tired springs during routine maintenance or keep spares on hand for a build.

The kit includes:

• UR-31 Rear Base Elevation Knob Spring
• UR-05 Ejection Port Cover Spring
• LR-32 Hammer Spring
• UR-07 Forward Assist Spring
• LR-22 Trigger Spring
• LR-16 Magazine Catch Spring
• FS-04 Front Sight Spring
• BT-05 Selector Spring
• LR-26 Selector Spring
• LR-31 Disconnector Spring
• LR-09 Bolt Catch Spring
• BT-08 Extractor Spring Assembly
• LR-14 Detent Spring

Why replace springs:

• Weak hammer and trigger springs can cause light strikes and a vague trigger reset
• A tired extractor spring is a common cause of failures to extract
• Worn detent and selector springs let takedown pins and the safety feel loose

The rear base elevation knob spring and front sight spring apply to rifles with A2-style sights. Compare the part numbers above against your rifle before installing, and function-check the rifle after replacing any fire-control spring.