2A Armament

Overview

The 2A Armament Builder Series Aluminum Castle Nut is a lightweight and durable component made from 6061-T6 aluminum, designed to securely fasten the buffer tube in place on your AR-15 build. Its black finish provides a sleek and uniform look, ensuring that it integrates seamlessly with other components. This castle nut is commonly found in various builds where weight savings and reliability are prioritized.