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Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt

Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt
Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt

Xtreme Performance Bolt (XPB) Carrier Group in FDE (Flat Dark Earth) Carrier and FDE Bolt

5.56 FULL AUTO BCG

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(45 customer reviews)
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SKU: SRCXPBCG-FDE
categories: AR15 Parts, All products, Bolt Carrier Groups (Full Auto capable)

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MPI, HPT and Shot-Peened
Magnetic Particle Inspected, High Pressure Tested, and Shot Peened. Guaranteed to perform under pressure.
Limited Lifetime Warranty
Limited Lifetime Warrantyy

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 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.  


Technical Specification

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


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 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


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


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.


MPI, HPT and Shot-Peened
Magnetic Particle Inspected, High Pressure Tested, and Shot Peened. Guaranteed to perform under pressure.
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. 

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Tags: Flat Dark Earth (FDE)

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WHAT OUR CLIENTS HAVE TO SAY

Daniel Guidry verified owner
Great product, have five BCG’s from Sharps all function properly with different barrel manufactures with no headspace issues, would highly recommend to a friend.


May 24, 2022
Rob Frizzell verified owner
I have always been a quarter-bore fan but I had been out of the shooting scene for a few years. I changed jobs and a coworker introduced me to the 25-45 Sharps. After seeing the how close the ballistics were to the 250 Savage (one of my favorite cartridges) it was pretty much a no brainer that I had to build one. Collecting parts on a budget can really try one's patience, but I finally got it finished the way I wanted it using not only a 20" SRC barrel, but a Balanced Bolt Carrier with Reliabolt as well. The barrel shoots great and the bolt is tough as nails.


January 26, 2021
Micharel Young verified owner
One of the best bolt carrier groups you can buy. S7 tool steel and a really smooth NIB-X finish... I own a lot of premium BCGs and this is one of best I've tried. Definitely worth the money when you look at the extra machining that went into this, better quality steel, enhanced design and features and a great finish. Let's also not forget this is a small US based company that stands by their products. I'll be highly disappointed if Sharps ever goes out of business. With what little money I have to spare, I've already ordered more BCGs from SRC and I'll continue to support them as long as they're in business.


March 25, 2022
Joseph Hinds verified owner
I have a light profile stainless 18" SRC barrel on my most recent build. It consistently shoots a little under MOA, and I used it to drop a 90 pound doe from 109 yards with a neck shot using factory 87 grain ammo. It was an instant kill and left a quarter size exit wound. My hunting buddies were very impressed.


February 11, 2022
John Darbyshire verified owner
This is my third Sharps DLC BCG. All are perfect and are used in two 5.56 and one 300Blk. Easy to clean and have never had ONE malfunction! Trust me the quality of these BCG is the best bar none. They do shoot softer and you can back off the buffer weights, I have backed off the adjustable gas block for one of the softest 5.56's around.


March 11, 2022
Mark L.verified owner
Exceptional BCG. The DLC coating is durable and cleans up easily. I've tried so many BCGs out there and these are my go-to because they are durable, reliable, and easy to clean up. I use them with 5.56 and .300BLK both suppressed and unsuppressed and they are good to go.


April 11, 2022
Archie M. verified owner
Delivery was FAST - FAST This bolt went into my 1st AR build. Fired 1st 200rds FLAWLESSLY SRC Bolts will be the only bolts I ever use in future builds. NEXT STOP....308 THANK YOU


February 9, 2024
Josh Williams verified owner
Previously I was a huge fan of the brand that cost twice what this one does and has a mirror like finish. I needed a bolt carrier for my coyote gun and tried this. It is an amazing bcg and didn’t even have to change my gas block from the other brand. In my opinion this is the best tactical or hunting bcg.


January 27, 2022
Teddy Rivera verified owner
Now that I’ve had some time with this BCG I can give my honest review. Several thousand rounds and this BCG just does not disappoint. Currently it lives in my third build Aero Precision 16” no issues what so ever. Keeping it clean is easy! No need to think about it. If you want an amazing BCG that will outlive even you this is the one.


December 23, 2023
Gordon Green verified owner
Purchased a new upper without the BCG. MY intention was to give Sharps a try from scratch with the new upper. Was not disappointed, in fact was very happy that this BCG was as good as my research suggested. About 1000 rnds. So far. Ordered a new bolt for my other Ar15.


February 22, 2022
Jeremiah Andrade verified owner
I had only heard of how amazing a Sharps 556 bcg was. After putting everything together and ran it, i am now able to say all the good things I heard were true! Now only if they would only get there 308 bcg back in stock will I be even happier.


January 2, 2024
Tres verified owner
Looks nice and performs well. Easy to clean all need is a rag and some gun oil. Pretty pricey but you get what you pay for. Awesome buy!!


November 13, 2023