Mil-Spec Receiver Extension Buffer Tube Lock Ring (Castle Nut)

$ 3.49

Ground Zero Precision

Ground Zero Precision's Mil-Spec AR receiver extension buffer tube lock ring (castle nut) is the perfect standard part for your AR15 or AR10. Its solid construction and clean matte black finish make it a great looking replacement, build project or spare part and we offer it at a great value for an essential item. If you need the parts to keep your AR in top shape, look no further than Ground Zero Precision!


  • Black phosphate finish
  • Gun quality tool steel construction
  • Manufactured and coated in the U. S. to exact Military specifications