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.
|Bolt and carrier:||S7 tool steel, shot peened and DLC coated (U.S. Patent No. 9,863,729)|
|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 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|
Technical Data on DLC Coating
|Coating thickness||2-4 Microns|
|Hardness HV 0.05||HRC 80+|
|Deposition method||PVD UBM/PACVD|
|Friction vs Steel||dry 0.1|
Limited Lifetime Warranty
If any SRC Bolt Carrier or Relia-Bolt™ is found to have manufacturer defects, SRC will repair or replace it at no charge. Manufacturer defects include out of spec parts and defective parts. Although our BCG is Mil-Spec, there are so many variables, sometimes a little troubleshooting, or fine tuning of parts may be required for proper functionality. Before a part is replaced or refunded, SRC reserves the right to inspect and test part(s) in question to determine if it is defective.