Sharps Xtreme Performance Bolt (XPB) 308 Balanced Bolt Carrier Group with Dual Ejectors In DLC (Diamond Like Carbon) Coating


Sharps Xtreme Performance Bolt (XPB) 308 Balanced Bolt Carrier Group with Dual Ejectors In DLC (Diamond Like Carbon) Coating

$279.99 $214.99

(14 customer reviews)

Sharps latest offering!
Our new 308 BCG is an upscale version of our very popular Sharps 5.56 Balanced Bolt Carrier Group with our patented Relia-Bolt™. Our 308 BCG is designed to be compatible with DPMS LR-308 and similar style AR-10 platform rifles.

Out of stock



The Sharps 308 Balanced Bolt Carrier Group Complete has the same innovative design as the Sharps 5.56 Balanced Bolt Carrier Group. The 308 carrier is precisely machined from case-hardened 8620 alloy steel. The 308 Relia-Bolt™ is made of robust 9310 nickel-chrome-moly alloy steel. The entire BCG is finished with DLC (Diamond Like Carbon) Coating. The Sharps 308 Balanced Bolt Carrier Group has the SRC logo machine cut and visible when the ejection port door is open. Bolt has dual ejectors.  Sharps 308 BCG is compatible with Generation 1 DPMS LR-308 style platforms.  Weight 17.7 oz.   This is NOT compatible with Generation 2 DPMS LR-308.  Sharps will not guarantee proper function with the use of  steel cases, or foreign ammunition.

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 DPMS Gen 1, 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: 9310 steel, shot peened DLC coated (U.S. Patent No. 9,863,729)
  • Bolt Carrier: 8620 steel, shot peened and DLC coated
  • 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 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
  •  .067″ Firing Pin
  • 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 DLC Coating

Coating thickness: 2 – 4 Microns

  • Hardness HV 0.05: HRC 80+
  • Deposition method: PVD UBM/PACVD
  • Friction vs. steel, dry: 0.1
  • Color: Matte Black / Hyper Black (Polished)

Additional information

Weight 17.7 oz

14 reviews for Sharps Xtreme Performance Bolt (XPB) 308 Balanced Bolt Carrier Group with Dual Ejectors In DLC (Diamond Like Carbon) Coating

  1. Everett Hunt (verified owner)

    When the Sharps Customer Service Rep said that they were working on a .308 Winchester BCG, I thought they were joking… NOPE! I am ecstatic to be one of the first to buy a SRC 308 BCG! Can’t wait to get it and try it out Thank you Sharps!

  2. Stephen prowse (verified owner)

    I am completing a 308 build. I enjoy my 25/45 a lot and decided I would use this bolt carrier group. My hope is that it is along side or better than the JP bolt group a lot of dealers wanted to sell me. Not going to be a 1000 yard tack driver but the 308 was never that to begin with. Hopefully this bolt will be as good as my 25/45 has been. I will rate it after the first range report. So far, so good. Thanks, Steve

  3. Stephen Prowse (verified owner)

    Just got the bolt carrier in last week. The fit is perfect in my Noreen firearms upper. Has a very nice ping on closing. Waiting on weather to get out and break it in. I was torn between this bolt group and the JP enterprises. But I like my 25/45 so I got this one. I will reevaluate after a range session. But so far it is good to go as far as fit and finish go.

  4. VINCENT J VENERO (verified owner)

    This is one smoooooooth operator. I purchased this BCG to use in my DPMS LR308 that I have had failure to eject problems with. This Sharps carrier group solved all the problems plus it cycles so smooth and fast. During rapid fire it sounds like an automatic. That’s how much faster it cycles. Plus it looks sharp, no pun intended. It also makes clean up a breeze too. The carbon build up, what little there is, even after 200-300 rounds, just wipes right off. The finish is so hard and smooth you don’t even need any cleaner. Its worth every penny so I’m going to buy another just to keep as a spare while they are still on sale. Save $100. or so.

  5. vincesr72 (verified owner)

    This is one smooth operator. I purchased this BCG for my DPMS LR308 and it has made all the difference in the world. I have put over 200 rounds through it and not one failure even with extreme rapid fire. It makes the rifle cycle nearly twice as fast. Clean up is a breeze, just wipe off with a cloth and the built up carbon just wipes right off. I can’t believe how easy it is to clean. The description doesn’t say it but it has dual ejectors, I am sure this has something to do with why it works so good. It looks sharp looking too, oh no pun intended. I bought a second one to keep while they are on sale.

  6. Stephen Prowse (verified owner)

    After getting to the range to checkout the build. I was able to fire 20 rounds. All I had of 308. A mixed lot of old and a couple of Ft. Scott munitions 168 grain solid copper rounds. The bolt group along with a heavy 5.7 oz buffer ejected the rounds at a 3:25 o clock position. Just about perfect. Accuracy was not a factor as I was only able to get on the 25 yd range. And I had no sights. However, just point shooting at that range was 3 inches of bad guy. So it did it’s job. This exceeded my expectations and I would say this bolt group was right alongside the JP bolt. A bit cheaper as well. Next test is with my new Athilon scope and the Ft. Scott ammo.

  7. Steve M. Potvin

    I have to say that this is probably the best complete BCG you will ever find anywhere Hands down. I took the 308 Win. build out to play and it was amazing. After tuning in my Superlative Arms Adjustable Gas Block the cycling was as smooth as silk and no problems with short strokes or slam stokes. I really like the dual eject pins instead of one like everyone else. A true stroke of genius. The finish is the strongest I’ve seen and like everyone else say, the clean-up is very easy. Looking forward to getting another one for my .260 Remington build, one for my 338 Federal Build and of course maybe a couple spares just to have around. A man can never have too many guns or BCG’s in his safe. So, if you’re looking for a BCG that not only out performs all the rest but is also much better priced than most out there, Sharps Rifle Company has the perfect BCG for you. I have both AR-15 and AR-10 versions and I am in the process of converting everything to the Sharps Relia-Bolts. All my other brands have been given to new homes, once spoiled with the SRC BCG’s I can’t go back to any other brand. Thanks SRC, you make the best BCG’s on the market. Keep up the good work.

  8. Rick Rodriguez (verified owner)

    Put this BCG in my .243 build with a 80% lower, Areo upper, Bear Creek Heavy Barrel an d Vortex scope. Seemed stiff, almost binding. After a few rounds it loosened up a bit, but would not fully seat and needed to use the forward assist. Inspecting the BCG it had scuff marks on the backside. Not sure if it’s the bolt or just needs time to break in. Ejected brass has VERY VISIBLE ejector marks with factory rounds… Winchester. Not sure if I will keep this BCG. I will post a follow up review next month after I handload some rounds.

  9. Mhickey (verified owner)

    I purchased this bcg on 01/31/2020 for my .308 build. I finished the rifle and took it out to test fire it on 2/8/2020. During the test fire I had several issues with the bcg. The issues were failure to extract the spent cartridge and double feeding. While at the rage I had 2 other bcg’s to use which was a failzero bcg and a aero precision bcg. I swapped the bcg and my gun ran flawless with the failzero and aero bcg. I put the sharps bcg in a friend Ar-10 and the same issues occurred. I tried emailing sharps rile company about this issues and have not received a response. The customer service is poor. If your looking for a BCG DONT BUY THIS! shop somewhere else. It’s been serval days with no response so I just ordered a bcg from failzero.

    • Kim Gedrose

      Our company policy states before a refund or replacement can be given, you must talk with one of our technicians. He called twice and left messages that you never returned. Although you did not follow company policy, a refund was given to you.

  10. GRUNT1807 (verified owner)

    I’m a fan of the XPB carrier group owning 3 of them in 5.56, so when Sharps came out with the 308 I had to have one. It’s been almost a year now and a little over 1000 rounds through my 20″ Aero/Faxon rifle. My XPB has been flawless during this time a cleaning a breeze.
    I plan on getting another one soon for my new 16″ 308 build.

  11. Josh (verified owner)

    Expertly crafted, beautifully finished as expected from Sharps. One Problem is that it will not trip the port door on my BAD762 upper. Tried a steel port door & a Polymer Strike door. Had to replace the carrier with something else to get this to work. This carrier will be used in the next build.

  12. Paladins Hammer

    After reading the review from Rick Rodriguez I would like to know if the Upper/Lower fit is tight or is there a pretty good gap between them. I have never had an issue with any of my SRC BCG’s but I have noticed that you need a nice close fit between the Upper and Lower Receivers. With the rear of the Sharps BCG being a bit larger in diameter you need very close tolerances otherwise the top of the BCG will rub on the inside top of the Buffer Tube causing the issue you are talking about. It amazes me how many people will settle for less that perfect fits between the Upper and Lower and then start blaming the other components for these type of issues coming up. And putting one of those little ruddbe wedges in there to stop the rattle makes it even worse because now you’re forcing the two receiver parts even further away from each other causing an even bigger issue. If you are having a tight cycle issue, try wrapping a bunch of strong rubber bands around the rear of the Upper and Lower and then try shooting again. You might see that fixes the problem. If so then you need to talk to you Receiver supplier, not the BCG company. This may not be the problem but I have seen this fix the issue for a lot of people. There is nothing wrong with saving a few bucks, but never settle for anything that is not a nice tight fit between the Upper and Lower Receiver. When the have a gap that you can see daylight between them, you are certain to have components wear out a lot fast because you are going to have friction in the Buffer Tube. A mil-Spec BCG is smaller in the rear than the Sharps BCG. Just food for thought.

  13. Marc (verified owner)

    I was looking for a BCG to finish a 6.5 Creedmoor build. Lots of $120 units available on line, however, all of them had Mil Spec firing pins which do not work well with the 6.5 high pressure rounds. One very large manufacturer has a small firing pin model, but fortunately for me they were sold out everywhere. Another company makes a bolt and sells it for the same price as SRC does for the entire BCG!!.

    I said fortunately because if one of those other BCGs was available I would have bought it, not knowing about SRC. I happened upon the SRC website when searching for a “DPMS bolt carrier group”. There was no mention in the main description of the firing pin size (which should be put in huge bold letters), and if I had not scrolled down to the technical data I would not be writing this review.
    Not believing what I was reading, I contacted SRC to confirm the firing pin size. I spoke with Colby on more occasions than she probably liked, but she was always accommodating and conscientious in getting me the information that I requested and even took a picture of the bolt face. Once ordered the BCG arrived in Virginia 5 days later.
    The BCG is unbelievable in finish and function. After 100 rounds today it looked like I just took it out of the box, and cleaned up with the wipe of a cloth. Not a single primer pocket crater or pierce. I own and have built over 15 AR style rifles and am sorry that they do not have SRC BCGs. Because I know now that if something goes wrong, it probably won’t be the BCG. Thank you SRC & especially Colby for making sure that I have the best BCG for my build.

  14. Leo

    Had this sucker about a year now, works great. I don’t use their carrier, I put this bolt in a titanium carrier, but the bolt is everything I want it to be.

    The dual ejectors solved my ejection reliability issues. Issues MANY large ARs have, the single AR15 size ejector used in most bolts just isn’t enough for larger .308 brass.

    I’m a big fan of their unique bolt lugs, I use both this bolt and their Relia-bolt in my silenced rifles. Silencers on ARs can get the inside of the barrel extension where the lugs must rotate rather fouled. Standard lugs have to push through that fouling and it slows the action causing problems. These bolts just trudge right through the fouling like it isn’t there. Whether you run a silencer, are concerned about debris, or just want to go many thousands of rounds without cleaning this bolt will vey much help.

    One thing of note, Sharps doesn’t mention in their description that their bolt uses the “high pressure” firing pin standard. This is smaller hole in the bolt for a smaller diameter firing pin designed to prevent primer issues in high pressure cartridges. This is a good thing, but it means most firing pins will not fit, they must be the high pressure version. This of course comes with a pin, but need to be aware if you have or are buying something like a titanium firing pin.

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