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 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.
Carrier is FDE (Flat Dark Earth) Brown
Bolt is DLC (Diamond Like Carbon) Black
Order cancellations may incur a 15% restocking fee. Please see return section
Technical Data
Bolt: S7 Tool steel, shot peened and DLC 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
Mil-Spec Extractor and Ejector Springs, Firing Pin Retaining Pin, Gas Rings
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
Technical Data on Coating
Bolt Carrier: ZrN Coating (Zinc)
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: Flat Dark Earth
Bolt: DLC (Diamond Like Carbon)
Coating thickness: 2 – 4 Microns
Hardness HV 0.05: HRC 80+
Deposition method: PVD UBM/PACVD
Friction vs. steel, dry: 0.1
Color: Black
Art Cruthis (verified owner) –
I have not yet been able to try out my new xpb but am confident it will perform as avertised. I did weeks of research before choosing sharps.
Rick K. (verified owner) –
My third SRC BCG and this FDE carrier looks darn nice in my Aero Precision Enhanced Upper in FDE. These guys work great! If I can keep buying one a year I’ll have these BCG’s for all my AR uppers in, uh, several years.
Aric Jester (verified owner) –
I want to say thank you very much, to express my appreciation to the Sharps employee that patiently answered my mamy questions. Love the bolt and carrier group some much I bought a second one as a gift for my friend who tolf me about you guys.
Bruce D. (verified owner) –
I completed my first ever build in May. Since the BCG is supposed to be the heart of the rifle I wanted to do my research to see which direction I should go. After seeing so many positive reviews on YouTube, I decided on the SRC in FDE. I’ve put about 1000 rounds through this rifle and I haven’t one malfunction or hiccup. I’m very impressed with the craftsmanship and quality that went into this bolt. I have some more builds planned and I’ll be using the SRC BCG’s on all of them.