The Sharps Xtreme Performance Bolt (XPB) in DLC (diamond Like Carbon), is our patented Relia-Bolt™ finished in DLC (Diamond Like Carbon) coating.
Patented Bolt Technology
The redesigned lugs of the Relia-Bolt™ virtually eliminate the most common MSR malfunction; the bolt to barrel extension jam. Haven’t cleaned your rifle? Is it out of time? The Relia-Bolt™ compensates by providing a patented camming action which guides the bolt past obstructions and into battery (U.S. Patent No. 9,863,729).
The rounded/tapered lugs push past carbon and debris when the square edges of traditional bolts would typically jam. Once into battery, the rear edges of the lugs fully engage the barrel extension for absolute strength and security.
Unmatched Strength and Durability
The Relia-Bolt™ is machined from S7 tool steel and tempered with SRC’s proprietary heat-treating process, significantly increasing strength when compared to MilSpec Carpenter 158. S7 provides a 75% increase in tensile strength, and nearly 60% improvement in yield strength.
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
Mil-Spec Extractor and Ejector Springs, Gas Rings
|Bolt:||S7 Tool steel, shot peened and DLC coated (U.S. Patent No. 9,863,729)|
|Extractor:||4340 Steel, Manganese Phosphate coated|
|Ejector:||S7, shot peened and Manganese Phosphate coated|
|Extractor Pin:||S7, shot peened and Manganese Phosphate coated|
Why S7 Tool Steel?
S7 has excellent shock absorbing properties which provide superior impact resistance when being utilized in the construction of Sharps Bolt Carrier Groups. S7 demonstrates high strength and toughness as well as a resistance to softening at moderately high temperatures, i.e. operating temperatures not exceeding 1000°F.
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.
Technical Data on DLC Coating
2 – 4 μm (Micro Meter) or 2-4 μ (Microns)
Hardness HV 0.05:
2000 – 2800 or 80+ HRC
Friction vs. steel, dry:
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. Please keep in mind that altering the product renders the warranty void.