The Sharps Xtreme Performance Bolt (XPB) 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 Carrier Group Complete 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.
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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 90+ HRC
Deposition method: PVD UBM/PACVD
Friction vs. steel, dry: 0.1
Color: Carbon Black