Product Description The Rival Arms Thread Protector is CNC-Machined from 416R stainless steel billet results in superior corrosion resistance and durability. Rival Arms RARA300001E Thread Protector 9mm Luger Gold PVD 416R Stainless Steel 1/2"-28 tpi at United States Association of Gun Owners $24.99 Buy Now Check Price on Amazon Check Price on eBay