The Sharps Xtreme Performance Bolt (XPB) Carrier Group Complete is comprised of our patented Relia-Bolt™ and our Balanced Bolt Carrier. Both are machined out of 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 fits standard AR-15/M16/M4 rifles chambered in .223/5.56, Sharps 25-45, and 300 Blackout calibers. The XPB carrier displays the SRC logo machine cut and is visible when the ejection port door is open.
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Bolt and carrier: |
S7 tool steel, shot peened and DLC coated (U.S. Patent No. 9,863,729) |
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Gas key: |
4130 Steel. attached with Grade 8 hardware, properly staked and DLC coated. |
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Cam pin: |
4340 Steel, Manganese Phosphate coated |
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Firing pin: |
Mil spec made of 8740 Steel, center-less ground, and Hard Chrome coated. |
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Extractor: |
4340 Steel, Manganese Phosphate coated |
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Ejector: |
S7, shot peened and Manganese Phosphate coated |
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Extractor pin: |
S7, shot peened and Manganese Phosphate coated |
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Weight: |
11.2 oz |
The properties we as shooters look for in an AR platform BCG, are hardness and wear resistance. S7 provides such attributes when heat-treated properly. Sharps has found that the key benefits from S7 tool steel are higher tensile strength and toughness which translate to longevity of use, i.e., a higher number of cycles the bolt can handle before it fails.
| Coating thickness: | 2-4 Microns |
| Hardness HV 0.05: | HRC 80 + |
| Deposition method: | PVD UBM/PACVD |
| Friction vs Steel: | Dry 0.1 |
| Color: | Black |
