Sharps AR-15 Xtreme Performance Bolt (XPB) Carrier Group Complete in DLC (Diamond Like Carbon) Black Carrier and Black Bolt


Sharps AR-15 Xtreme Performance Bolt (XPB) Carrier Group Complete in DLC (Diamond Like Carbon) Black Carrier and Black Bolt

$219.99 $184.99

(47 customer reviews)

The Sharps Xtreme Performance Bolt (XPB) Carrier Group Complete is comprised of our patented Relia-bolt, and our Balanced Bolt Carrier.  Both Balanced Carrier and Relia-Bolt are coated in DLC (Diamond Like Carbon) Coating.

SKU: SRCXPBCG Categories: , , ,


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 DLC (Diamond Like Carbon) 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. Weight: 11.2 oz.

Note:  Sharps will not guarantee proper function with Palmetto State Armory/Noveske platforms.  

Sharps will not guarantee proper function with the use of  steel cases, or foreign ammunition.  

 Color: Carrier and Bolt DLC (Diamond Like Carbon) Black

Order cancellations may incur a 15% restocking fee.  Please see return section

Limited Lifetime Warranty

If any SRC Balanced Bolt Carrier 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.

Technical Data:

Bolt and carrier: S7 tool steel, shot peened and DLC coated (U.S. Patent No. 9,863,729)
Gas key: 4130 Steel. attached with Grade 8 hardware, properly staked and DLC coated.
Cam pin: 4340 Steel, Manganese Phosphate coated
Firing pin: Mil spec 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 over 200ft/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 DLC Coating

Coating thickness: 2-4 Microns
Hardness HV 0.05: HRC 80+
Deposition methid: PVD UBM/PACVD
Friction vs Steel, dry 0.1
Color: Black

Made in the USA

Additional information

Weight 11.20 oz

47 reviews for Sharps AR-15 Xtreme Performance Bolt (XPB) Carrier Group Complete in DLC (Diamond Like Carbon) Black Carrier and Black Bolt

  1. Jose Santiaguel (verified owner)

    The best ever bolt carrier I ever bought. I hope you guys will make a bolt carrier for 308.

  2. Dorian Miller (verified owner)

  3. Raymond (verified owner)

    Awesome looking product had the opportunity to fire my .300 blackout Springfield Saint pistol with the new bolt and just an amazing product. Very easy to clean thanks guys

  4. James (verified owner)

    Sharps has absolutely the best bolt of many that I have tried from different manufacturers, on bolt carriers you get what you pay for and sharps you get alot of quality for the price. It’s not my first from them and it won’t be the last. Thanks again

  5. Maverick (verified owner)

    Recently purchased this BCG. I am very happy with the quality of the product. Would buy again and recommend to friends.

  6. Merickwise (verified owner)

    I have had flawless operation with the first XPB BCG that I purchased. Cleaning is fast and easy even with the dirtiest of ammo. Requires only the slightest amount of lubrication and I have not seen any ware. I feel so good about this bcg that when I sat down to build my wife an AR I knew this was one of the parts that would be in it.

  7. J W (verified owner)

    Slick, Clean, Excellent

  8. Peter Brandt (verified owner)

    Received my order very quickly and in perfect condition the coating is so smooth have put about 100 rounds thru it cycles great . So far so good

  9. Eddie (verified owner)

    Love this BCG.

  10. MattyAZ (verified owner)

    This BCG lives up to its reputation. Not one single misfire or extraction. Recoil seems a bit less as well, but could be me. Ran 120 rounds straight with a binary trigger. No issues. Cleanup was a breeze. Tiny bit of solvent on a rag and some wiping cleans it right up. Will definitely buy again for other ARs.

  11. Albert Egreczky (verified owner)

    Bolt carrier received in a timely manner. Quality and workmanship is excellent. Works great in my AR-15. Met all my expectations.

  12. Erik (verified owner)

    Slick as snot first of all. Second the bolt is a nice upgrade to the DI AR’s.

  13. Zachary Barker (verified owner)

    So far so good, but haven’t got to put it to the test as it is for a new build that isn’t complete yet.

  14. Victor Vargas (verified owner)

    XPB BCG looks amazing and works great. Extremely satisfied, will definitely be use more XPB BCG in future builds

  15. Joseph R. (verified owner)

    Received this bolt carrier group quickly and once I opened it the fit and finish is great. Performs wonderfully and look forward to using these bcgs for all future builds. If you’re considering this item, you won’t be disappointed.

  16. Tino Saenz-Diez (verified owner)

    Excellent Quality and Great Customer Service

  17. Demetrios Logan (verified owner)

    Ordering process was smooth, shipping was fast and product is superb!

  18. Anthony Jackson (verified owner)

    Always fast shipping, on the best BCG for me.
    Thanks again.

  19. Larry Sartin (verified owner)


  20. brian tran (verified owner)

  21. William (verified owner)

    Very nice for the money. Hell, pretty nice period. cycles very smooth.

  22. Steve Broom (verified owner)

  23. Frederick Bryant (verified owner)

    I purchased a XPB carrier group from Sharps and checked the headspace in it. Everything was great. The DLC was slick to the hand and it ran flawlessly with the 500 rounds I put down range after checking the headspace. I’m very pleased with the overall performance and extremely pleased with the fast shipping to my home. Sharps, I’ll be purchasing another soon. Thanks

  24. Robert Binnion (verified owner)

    I’ve always purchased the cheapest BCG I could get. I mean mil-spec is all the same right? Sharps has changed my thinking, they have built the better mouse trap. I usually put my money into the barrel and trigger group. This BCG completes the the firing line. This is more than an upgrade. It is a necessity

  25. JR (verified owner)

    Skip the fancy names. You want an amazing BCG, look no further. This BCG runs like it was born in my rifle.

  26. ABEL RAMIREZ (verified owner)

    I just received this bolt less then a week ago to finish my SPR. THIS BOLT HAS A GREAT FINISH. I have not took it to the range but after all my reach I feel confident it will be the best I’ve owned. Shipping took longer then expected but it is the time of the holidays and I’ll blame it on that. Over all I am happy with the service from SRC.

  27. Aric Jester (verified owner)

    I purchase another bcg and love it. Thanks for continuing to male such great quality items.

  28. Steve-o

    Purchased my bcg through a different retailer since it was on sale. Im currently trying to track down another. These bcg’s are a must for me now. The entire bolt has been reinvented by these guys. No need to spend 300+ dollars on high end bcgs. The price point on these sharps bcgs is surprisingly low considering the quality and craftsmanship that goes into them.

  29. Luis Orti mz (verified owner)

    I really love the performance of this bolt carrier group. I would definitely buy another. Maybe in fde or nickel boron next time. 👍

  30. Kennedy (verified owner)

    Finally I cleaned my rifle after 3000 rounds (Not shooting at the same time). Every-time I fired that weapon the bolt performed awesome. I have couple of the DLC bolt carriers and I love it. I cleaned the bolt and it looks like the day I bought it. Wow!!!

  31. taxguypro (verified owner)

    First complete BCG I bought several years ago was NP3 coated then, with logo and bucking bronco stamped on the front most part of the viewable part of the BCG, wished SRC still did that! Of course that made my plain Jane AR 15 look cool, the BCG made it a new gun! I have now purchased several for rebuilds and new build rifles. I keep coming back I have to admit I have tried other, most of them end up in the parts box others are ok enough to put the Relia Bolt in. Others may have the DLC on their BCG but they are not as finely finished and balanced like a full blown SRC BCG in DLC or the Nickel Boron BCG , that looks real nice in my new heavy stainless steal 18 in barrel build I am just completing.

  32. Peter Marcos

    Having bought a Reli-Bolt a month ago with zero issues, that’s full auto, multiple mag dumps, figured its time to try the carrier, (ordered it Friday & got it Monday) I beat the BCG with about 1000 rds w/o a single problem, I can say this is my go-to bolt carrier for all my builds. GREAT Product SRC!!
    Thanks again Kim, you are the best.

  33. John (verified owner)

    Best BCG I ever purchased! Got this for my light weight 20” build. Got two AR-10’s to build so I will be using your products from here on out. I was a cnc machinist for 20 years and held tol. of +/- .00025 for all that time and even in microns with chilled coolant machines on special occasions. I know quality when I hold it in my hands! Yes I know you had a problem with the heat treatment with one batch of bolts way back when, but what company doesn’t have problems at least once? That’s how you grow and learn. Keep up the good work!

  34. Alex (verified owner)

    I did a lot of research on different company’s and different bcg’s during which I ran across the sharps bcg and I’ll say that I am extremely impressed these are some amazing bcg’s I feel as if you could buy a cheaper ar15 and replace the bcg with one of these bcg’s and you’d have a mid rate rifle just by swapping to this bcg

  35. Roger (verified owner)

    Just got my Sharp BGC in DLC & went straight to the range this past weekend. After lightly oiling, the very first round jammed. After clearing I put 300 rounds through without any further issues. This BCG performed flawlessly, you instantly feel the reduced recoil. I have no doubts it will continue to perform as expected, will definitely recommend.

  36. Steve M. Potvin

    I was looking for something I could truly depend on for some Youth Camp builds and so I called SRC to clear up a few concerns I had. I had never heard of the SRC Reliabolt with the DLC and I wanted to know more before making any commitment. After spending quite a bit of time on the phone with SRC I decided to go with this BCG. And I have to say that it has been the best decision I could have ever made for a BCG. These units are incredible with that smooth DLC finish and the design of the Bolt itself is nothing short of genius. I built several AR’s for the youth group and took them to camp this summer and I can honestly say that these BCG’s performed flawlessly. Yes they were so easy to clean after shooting but more important than that is the fact that they made such a reduction in recoil and functioned so smoothly that even thee little ones 7 years old shot these AR’s and had a great time. We went through a little over 3,500 rounds of 87 Grain 25/45 Sharps in just a few days. That has been the most fun these kids have had at the shooting range in over 25 years. The only thing that could have made it better would have been having 3 times as much ammo to shoot. These are the best BCG’s I have used in all my 45+ years of shooting and I will never go back to anything less than an SCR BCG for all my builds. I’ve even got all my friends buying them now, everyone is impressed with them. Now we need to start working on getting more ammo for next year, and I am sure that next year we will be at least doubling our ammo use. But, more than likely triple on the ammo, it was that much fun and so worth it. SRC, you did great. Thank you.

  37. Kirby Carranza (verified owner)

    Operates flawlessly!

  38. Joe (verified owner)

    After only a few hundred rounds I can’t say this is better than any other bcg out there. But I can say I e had 0 problems the action is super smooth ,just pulling back the charging handle there is no grit. The bcg is super easy to clean I wiped it down with a dry shop towel and it was good enough then added a little oil and Two minutes of time and looked brand new. So you get a good product with a lifetime warranty and great customer service what more could you ever need?

  39. Robert Murray (verified owner)

    Researched like crazy for a quality BCG for my AR that was very unreliable because of jamming issues that none of my friends or I could pinpoint. I read articles and watched video reviews, as well as getting advice from my son who is a Marine and my own personal balistics & firearms expert. I narrowed my choice down to a Sharps or Radian. The DLC was a very big point that put the Sharps over the top. Plus, I like to support “the little fish in the big pond”, I hadn’t heard of them before I started researching. The turn around time was great (I live in CO, so I’m just down the road). I got the BCG in my rifle, but it would get jammed in the buffer tube. I called & Kim said she’d have Tony in tech support call me back. After talking to Tony, we figured out that the front lip on my buffer tube was peeling in and the fatter end was getting jammed in the tube because the tolerance is so tight. I replaced the buffer tube and was able to run a few magazines thru. The noticeable difference in felt recoil was great and the rifle stays on target better with the bolt running a direct line. I had my buddy try it and he was impressed. We pulled the BCG out of my rifle and put it in his so he could empty a magazine with it. He was truly amazed and he’ll be picking one up to run in his rifle! Great product, great price and great company, just picked up another BCG for the pistol built I’m completing. Thank you so much!!!

  40. flemtp (verified owner)

    This is the best BCG I have ever used! I am a very active shooter and have put 8500-9500 rounds through it . The BCG has performed flawlessly!! I have referred my friends to SRC ! Thanks for making an incredible BCG!!

  41. Lyle Morton (verified owner)

    I put one of these in my homemade 25-45 Sharps upper (the barrel of course is also from SRC Arms). So far it is working well. It cleans easily and runs smoothly. Not sure what more I could ask of it. I just wish the folks here at Sharps would make one for my 224 Valkyrie.

  42. Danny Carter (verified owner)

    A perfect replacement in my Colt AR-15. I have fired 250 rounds and the performance is excellent. Easy to clean and runs smoothly. I recommend and will purchase additional.

  43. Glock9mm99 (verified owner)

    Wow this item is a work of art! I have owned a lot of bolt and carrier groups but this one far exceeds all of them on finish machining and applied diamond-like finish. perfection at the highest possible level! Great company. Excellent product

  44. Ethan (verified owner)

    Even during all of the craziness in the world with this covid mess Sharps delivered an outstanding product in just a few days. I have reliabolts in all my rifles and a few of your extreme performance carriers. I have and will continue to trust your products with my life. Thank You.

  45. rahoyster (verified owner)

    Bought mine years ago . Countless rounds, it just runs and runs

  46. Marc (verified owner)

    Purchased this SRC DLC BCG for my 8.00″ 300BLK AR about a year ago.

    I am currently finishing a new build *12.50″ 300BLK*. I purchased another Sharps DLC BCG.

    That should say everything.

    Thanks Sharps Rifle Company.

  47. T. Cerreta (verified owner)

    I have shopped a lot of BCG’s and this is absolutely the finest one I ever had the privilege of reviewing. The quality and precision manufacturing of this piece is unquestionably one of the best ,if not the best on the market for the very reasonable price tag.I contemplating buying a second one to leave on my mantle ,just to admire, lol
    You definitely will not be disappointed

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