Ergo Grips

Overview

The Ergo Castle Nut for AR-15 is a precision-engineered component designed to securely fasten the buffer tube to the lower receiver, ensuring stability in your build. Made from durable steel and finished in black, this castle nut provides the strength necessary for reliable operation, particularly in builds utilizing a carbine-length gas system with a 5.56 NATO caliber. This part is commonly found in a variety of tactical and sport shooting configurations, making it a staple for builders looking to enhance their AR-15 performance.