Sharps Xtreme Performance Bolt (XPB) Bolt Carrier Group in DLC 6.5 Grendel

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The Sharps Xtreme Performance Bolt (XPB) Balanced Carrier Group Complete is comprised of our patented Relia-Bolt™ and our Balanced Bolt Carrier. Both are machined out of S7 tool steel.

On sale: ~~$269.99~~ $244.99

Retail Price:$269.99

You Save:$25.00(9%)

Part Number: SRCXPBCG-6.5G

Availability: 5 In Stock.

Quantity

Description

Sharps Xtreme Performance Bolt (XPB) Balanced Carrier Group

Product Description

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 ZrN (Zirconium Nitride) Coating Bolt Carrier and DLC Bolt.

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.

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 6.5 Grendel.

Technical Data

Bolt: S7 Tool steel, shot peened and DLC coated

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, NiB-X 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.

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, Firing Pin Retaining Pin, Gas Rings

Technical Data on ZrN Coating (Zinc) (Bolt Carrier)

Coating thickness: 0.2 – 0.5 Microns

Hardness HV 0.05: 1500-1800 or 70+ HRC

Deposition method: PVD UBM/PACVD

Friction vs. steel, dry: 0.5

Color: Black

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. Please keep in mind that altering the product renders the warranty void.

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Sharps Xtreme Performance Bolt (XPB) Bolt Carrier Group in DLC 6.5 Grendel

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