Fortis Manufacturing End Plate & Castle Nut – AR-15/AR-10

The Fortis Manufacturing End Plate & Castle Nut set provides a precision-machined upgrade for securing buffer tubes on AR-15 and AR-10 platforms. This combo replaces standard mil-spec components with hardened steel construction designed for secure, repeatable installations. Shooters building or rebuilding a lower receiver will appreciate the tight tolerances and clean thread engagement that prevent loosening under recoil.

Both components are manufactured from hardened steel with a matte black finish for corrosion resistance and low-profile aesthetics. The castle nut features standard staking points for permanent installation. This is a drop-in replacement requiring only a castle nut wrench and staking punch—standard tools for any AR builder or armorer. The end plate accommodates QD sling swivel attachments.

• Part Type: Buffer Tube End Plate & Castle Nut
• Compatible Firearms: AR-15, AR-10
• Material: Hardened Steel
• Finish: Matte Black
• Installation: Drop-In (castle nut wrench and staking punch required)
• Includes: (1) End Plate, (1) Castle Nut