Buffer retainer detent and spring set for the AR-15 lower receiver. The detent (plunger) and its spring seat at the rear of the lower and capture the buffer and recoil-spring assembly, keeping the buffer from popping forward when you open the upper. A common replacement small part for builds and repairs.

Features:

• Buffer retainer detent (plunger)
• Buffer retainer spring
• Standard AR-15 replacement small part

Fits standard mil-spec AR-15 lower receivers.