Fortis End Plate & Castle Nut

The Fortis Quick-Detach End Plate & Castle Nut combo delivers matched AR-15 and AR-308 buffer tube components engineered for minimal weight without compromising structural integrity. This combo pairs the QD End Plate—featuring a quick-detach swivel socket design optimized for carbine-profile buffer tubes—with Fortis's billet aluminum castle nut, creating a cohesive upgrade path for operators building or refining precision rifle systems.

The castle nut is machined from solid billet aircraft-grade aluminum, significantly reducing overall system weight compared to standard mil-spec hardware while maintaining mil-spec buffer tube compatibility. The QD End Plate accommodates the quick-detach socket interface, enabling rapid accessory changes in the field without tools. Both components integrate seamlessly with standard carbine and rifle-length buffer tubes, making this combo suitable for both AR-15 and AR-308 platforms. Combined weight is just 0.06 lbs, meaning component selection here won't compromise your rifle's balance or handling characteristics.

This combo addresses the specific needs of precision shooters, tactical trainers, and law enforcement armaments specialists who prioritize weight savings across every subsystem without sacrificing durability. Builders focused on lightweight configurations—whether for long-range precision work, dynamic training scenarios, or duty rifles—will find this combination delivers both functional improvement and measurable weight reduction. The quick-detach interface appeals to operators who regularly swap slings, braces, or stock systems as part of their operational setup or training evolution.