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 the FDE (Flat Dark Earth) ZrN (Zirconium Nitride) Coating.
The XPB carrier displays the SRC logo machine cut and is visible when the ejection port door is open. The XPB fits standard AR-15/M16/M4 rifles chambered in .223/5.56, Sharps 25-45, and 300 Blackout calibers. Sharps will not guarantee proper function with the use of steel cases, or foreign ammunition.
Limited Lifetime Warranty
If any SRC Balanced Bolt or Relia-Bolt™ is found to have manufacturer defects, SRC will repair or replace it at no charge. Manufacturer defects include broken lugs, out of spec parts or 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.
|Bolt:||S7 Tool steel, shot peened and ZrN coated (U.S. Patent No. 9,863,729)|
|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|
Technical Data on ZrN Coating
|Coating thickness:||2-5 μm (Micro Meter) or 2-5 μ (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|
- Batch MPI and HPT tested
- Mil-Spec Extractor and Ejector Springs, Firing Pin Retaining Pin, Gas Rings
- 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
Order cancellations may incur a 15% restocking fee. Please see return section