The Cmmg AR-15 Buffer Retainer is a precision-engineered component designed for the AR-15 rifle platform ensuring optimal performance and reliability. Crafted with durability in mind this buffer retainer securely holds the buffer and buffer spring in place within the lower receiver extension preventing unwanted movement and potential malfunctions. Ideal for both new builds and maintenance of existing rifles the Cmmg AR-15 Buffer Retainer is a must-have for firearm enthusiasts seeking to maintain the integrity and efficiency of their AR-15.