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

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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

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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

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