Strike Industries TRIBUS Enhanced Castle Nut & End Plate AR-15/AR-10 3 QD Points Black Hardcoat Anodized

The Strike Industries TRIBUS Enhanced Castle Nut & End Plate is an upgraded lower-receiver component set for the AR-15, AR-10, and PCC platforms, built around an anti-rotation castle nut paired with an extended end plate. The TRIBUS design uses a set screw to lock the castle nut in place once properly torqued, solving the common problem of the castle nut backing off during hard use.

The extended end plate adds three total QD (quick-detach) sling mounting points (left, right, and an additional QD location) for ambidextrous sling setup. The piece is finished in Black Hardcoat Anodized for corrosion resistance and long service life.

Designed as a direct replacement for the mil-spec castle nut and end plate on any AR-15, AR-10, or PCC using a mil-spec buffer tube, the TRIBUS is a drop-in upgrade. The combination of anti-rotation security and three QD sling points makes it well suited for users running two-point or single-point sling configurations on rifles, carbines, and pistol-caliber builds.

Key Features:

• Anti-rotation castle nut with set screw to prevent loosening
• Extended end plate with 3 QD sling mounting points (left, right, and additional QD)
• Fits mil-spec AR-15, AR-10, and PCC buffer tubes
• Black Hardcoat Anodized finish
• Drop-in replacement for the mil-spec castle nut and end plate