Sharps XPB 5.56 Bolt Diamond Like Carbon Coated (backordered, ships 1/10)
The Sharps Xtreme Performance Bolt (XPB) with DLC (Diamond Like Carbon) Coating; extreme hard coating and scratch resistance. In addition, the new bolts have gone through a 24-hour thermal cycle proprietary heat treatment.
Bolt: S7 Tool steel, shot peened and DLC coated
Extractor: 4340 Steel, Manganese Phosphate coated
Ejector: S7, shot peened and Manganese Phosphate coated
Extractor Pin: S7, shot peened and Manganese Phosphate coated
Mil-Spec Extractor and Ejector Springs, Gas Rings
Batch MPI and HPT tested
Tensile strengths of 1550-1600 mpa, or 220,000-235,000 psi.
Toughness of over 200 ft./lb. Charpy C-Notch
HRC of 46 yields a 15% increase in hardness at the same toughness comparing to Carpenter 158 & 9310