Fortis Standard Billet Aluminum Castle Nut for Mil-Spec Buffer Tubes

Upgrade your AR build with the Fortis Standard Castle Nut — a precision-machined component crafted from solid billet aircraft-grade aluminum. Designed as a direct replacement for standard steel castle nuts, this lightweight alternative delivers meaningful weight savings without compromising strength or durability. The Fortis Standard Castle Nut is compatible with mil-spec buffer tubes, making it a straightforward drop-in upgrade for builders and shooters looking to trim ounces from their rifle without cutting corners on quality. Whether you’re assembling a competition build, a hunting rifle, or a general-purpose AR, this castle nut offers an easy, cost-effective way to refine your setup. At Deep Roots Rifle Co, we carry a strong selection of AR components and accessories from trusted brands like Fortis — available online with fast shipping nationwide or in person at our Eustis, Florida gun store. Order yours today and let our knowledgeable staff help you complete your build right.