Geissele Super Duty Stainless Takedown Pin Set 05-1087 is a premium upgrade kit for AR-15/M4 lower receivers, offering stainless steel pivot and takedown pins, detents, and springs crafted for exceptionally smooth and reliable function. Designed for long-term corrosion resistance and precision fit, this set provides enhanced durability and performance over standard mil-spec pins. Material: 17-4 or 416 stainless steel for maximum corrosion resistance and longevity Includes stainless pivot pin, takedown pin, two detents, and two springs Precision machined to Mil-Spec AR-15 dimensions (approx. 0.245? diameter for 0.250? lower pin holes) Black nitride or phosphate finish (varies by batch) for added surface hardness and wear resistance Made in the USA for trusted quality and consistency Geissele Super Duty Stainless Takedown Pin Set 05-1087