Sharps Rifle Co XPB Xtreme Performance BCG - AR15

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.We offer a 30-Day Money Back Guarantee on our complete line of Sharps bolt and bolt carrier products.Technical DataBolt: S7 Tool steel, shot peened and DLC coatedBolt Carrier: S7 Tool steel, shot peened and DLC coatedGas Key: 4130 Steel, attached with Grade 8 hardware, properly staked and DLC CoatedCam Pin: 4340 Steel, Manganese Phosphate coatedFiring Pin: Mil Spec firing pin made of 8740 steel, center-less ground and Hard Chrome coatedExtractor:  4340 Steel, Manganese Phosphate coatedEjector: S7, shot peened and Manganese Phosphate coatedExtractor Pin: S7, shot peened and Manganese Phosphate coatedMil-Spec Extractor and Ejector Springs, Firing Pin Retaining Pin, Gas RingsBatch MPI and HPT testedTensile strengths of 1550-1600 mpa, or 220,000-235,000 psi.Toughness of over 200 ft./lb. Charpy C-NotchHRC of 46 yields a 15% increase in hardness at the same toughness comparing to Carpenter 158 & 9310   Technical Data on DLC CoatingCoating thickness: 2 - 4 μm (Micro Meter) or 2-4 μ (Microns)Hardness HV 0.05: 2000 – 2800 or 80+ HRCDeposition method: PVD UBM/PACVDFriction vs. steel, dry: 0.1Color: Carbon Black