Brownells AR-15 Buffer Retainer Spring Features The Brownells AR-15 Buffer Retainer Spring is manufactured to precise tolerances with materials and finish at least equal to OEM specification ensuring it performs exactly as the original factory part did. This spring works together with the buffer retainer to hold the buffer and action spring securely seated inside the lower receiver during firing. A worn or broken spring can allow the buffer to work loose leading to malfunctions so replacing it restores proper function to the buffer system. It is a small part that plays an outsized role in keeping an AR-15 running reliably. This spring is built as a direct-fit replacement for any standard AR-15 platform rifle and installs quickly during routine maintenance. It is sold individually making it an economical option for an emergency spare or for completing a parts build from scratch. Owners restoring an older rifle to proper working condition can count on it to match factory-equivalent performance. The Brownells AR-15 Buffer Retainer Spring is a simple affordable fix that keeps your rifle s buffer system functioning as intended. Brownells AR-15 Buffer Retainer Spring Specifications Manufacturer: Brownells Model: AR-15 Buffer Retainer Spring Compatible Hosts: AR-15 Quantity: 1 Available At: GrabAGun