Spikes Tactical Delta Ring Assembly w/Mil-Spec Barrel Nut. Spikes Tactical machined these AR 15 Parts with a rugged chromoly steel barrel nut with a phosphate finish so that they will outlast the elements to provide many years of use to your firearm. This Spikes Tactical SDR100A Delta Ring Assembly also includes a aluminum delta ring with a black anodized finish for maximum toughness. Grab your Spikes Tactical Delta Ring Fully Mil-Spec Assembly to add the finishing touches to your upper. Specifications for Spikes Tactical Delta Ring Assembly w/Mil-Spec Barrel Nut: Manufacturer: Spikes Tactical Condition: New Color: Black Country of Origin: USA Features of Spikes Tactical Delta Ring Assembly w/Mil-Spec Barrel Nut: Assembly Includes: Barrel Nut. Weld Spring. Snap Ring. Delta Ring. Weight: 2.5oz. Package Contents: Spikes Tactical Delta Ring Assembly w/Mil-Spec Barrel Nut Spikes Tactical SDR100A: Delta Ring Assembly w/Mil-Spec Barrel Nut