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 DPMS LR-308 style platforms.
We offer a 30-Day Money Back Guarantee on our complete line of Sharps bolt and bolt carrier products.
If any Relia-Bolt™ is found to have defects in materials or workmanship, SRC will repair or replace it at no charge.
- 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)