Sharps XPB Bolt Carrier Group 5.56 FDE

$ 199.95 $ 219.99

*Take $40 off all Sharps Rifle BCGs w/ code: SHARPS40

The Sharps XPB Bolt Carrier Group in Flat Dark Earth (FDE) is precisely machined from S7 tool steel. The XPB undergoes a 24-hour thermal cycle proprietary heat treatment and is finished with ZrN (Zirconium Nitride) Coating. Includes Sharps Lifetime Warranty! The XPB has the same design as the Balanced Bolt Carrier Group with the Sharps Reliabolt and 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 5.56/.223, 25-45 Sharps and 300 Blackout calibers.


Technical Data
Bolt: S7 Tool steel, shot peened and ZrN coated
Bolt Carrier: S7 Tool steel, shot peened and ZrN coated
Gas Key: 4130 Steel, attached with Grade 8 hardware, properly staked and ZrN 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 ZrN Coating
Coating thickness: 0.2 - 0.5 Microns
Hardness HV 0.05: 1500-1800 or 70+ HRC
Deposition method: PVD UBM/PACVD
Friction vs. steel, dry: 0.5
Color: Flat Dark Earth

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