Presma Aluminum Castle Nut — Fits .223 / 5.56 / .308 Buffer Tube & Receiver End Plates — Cerakote Bright Purple

Upgrade your build with the Presma Aluminum Castle Nut, machined from aircraft-grade aluminum and finished with authentic Cerakote for long-lasting corrosion resistance and matched styling. Engineered to Mil-Spec dimensions for reliable fitment with .223 / 5.56 / .308 buffer tubes and receiver end plates, this castle nut provides secure stock retention while reducing weight compared to steel alternatives.

Features:
- Brand: Presma — precision CNC machined
- Material: aircraft-grade aluminum (lightweight, strong)
- Finish: genuine Cerakote (available in multiple Cerakote colors)
- Mil-Spec dimensions for .223 / 5.56 / .308 compatibility
- Low-profile design and tested for torque retention
- Compatible with standard castle nut wrenches and end plates
- Ideal for builders, armorers, and finish-focused custom builds