Enhance your AR platform with the Presma Aluminum Castle Nut, designed specifically for .223, 5.56, and .308 buffer tube receiver end plates. This durable purple finish adds a unique style while ensuring supreme reliability and functionality. Constructed from high-quality aluminum, this castle nut is lightweight yet robust, providing exceptional stability and resistance to wear. Perfect for both competitive shooters and enthusiasts seeking a custom look. Precision-engineered for optimal fit Durable aluminum construction Distinct purple anodized finish Compatible with standard buffer tubes Upgrade your firearm with the Presma Aluminum Castle Nut for effective performance and standout aesthetics.