Sharps Xtreme Performance Bolt (XPB) 308 Balanced Bolt Carrier Group Complete In DLC (Diamond Like Carbon)


Sharps Xtreme Performance Bolt (XPB) 308 Balanced Bolt Carrier Group Complete In DLC (Diamond Like Carbon)

$279.99 $199.99

(6 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.

171 in stock

SKU: SHARPSXPB308 Categories: , ,


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. 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. 

We offer a 30-Day Money Back Guarantee on our complete line of Sharps bolt and bolt carrier products.

Limited Lifetime Warranty

If any Relia-Bolt™ is found to have defects in materials or workmanship, SRC will repair or replace it at no charge.

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
  • 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 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

6 reviews for Sharps Xtreme Performance Bolt (XPB) 308 Balanced Bolt Carrier Group Complete In DLC (Diamond Like Carbon)

  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.

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