The Sharps XPB (Xtreme Performance) Bolt Carrier Group Complete is precisely machined from S7 tool steel. The XPB undergoes a 24-hour thermal cycle proprietary heat treatment and is finished with DLC (Diamond Like Carbon) Coating. The XPB Bolt Carrier Group displays the SRC logo machine cut and visible when the ejection port door is open. The XPB fits standard AR-15/M16/M4 rifles chambered in .223/5.56mm, 25-45 Sharps and 300 Blackout calibers.
Technical Data Bolt: S7 Tool steel, shot peened and DLC coated Bolt Carrier: S7 Tool steel, shot peened and DLC coated Gas Key: 4130 Steel, attached with Grade 8 hardware, properly staked and DLC Coated Cam Pin: 4340 Steel, Manganese Phosphate coated Firing Pin: Mil Spec firing pin made of 8740 steel, center‐less ground and Hard Chrome 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, Firing Pin Retaining Pin, 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
Technical Data on DLC Coating Coating thickness: 2 - 4 μm (Micro Meter) or 2-4 μ (Microns) Hardness HV 0.05: 2000 – 2800 or 80+ HRC Deposition method: PVD UBM/PACVD Friction vs. steel, dry: 0.1 Color: Carbon Black