SV Precision Black is the hardest, most wear resistant and smoothest bolt carrier group coating available. Created from a highly advance Chemical Vapor Deposition (CVD) technology that produces a flexible pure form of amorphous carbon, consisting of sp3 bonded carbon atoms. Having the surface characteristic of both lipophilic and hydrophobic makes it non wettable with water but easily wet with oil; a characteristic found in few bolt carrier group coatings. This technology produces excellent tribological properties that make it very suitable in environments with extreme contact pressure and sliding actions. When you choose Black, you are choosing the lowest coefficient of friction coating on the market today requiring minimal to no lubrication. In addition, Black is a chemically inert coating that reduces carbon build-up. This top-of-the-line bolt carrier group coating will enhance performance and precision due to a much smoother sliding action while also displaying a sleek external appearance.


  • Coefficient of Friction: 0.01
  • Hardness: 3000 Vickers
  • Max Temperature: 1,100° F
  • Thickness: 2-3 microns
  • Color: High Luster Black


  • Increased Lubricity
  • Wear Resistant
  • Smoother Recoil
  • Improved Consistency
  • Faster Cyclic Rate
  • Easier Cleaning
  • Reduced Carbon Fouling

Additional information

Weight .72 lbs

SV Precision Steel Black .223/556/300 AAC Blackout BCG


SV Precision coated bolt carrier group (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. SV Precision BCG includes the proper chrome lined and heat treated gas key. Gas key is secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This insures a strong staking and proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158® steel and shot peened for increased strength per Mil-Spec; includes tool steel extractor with spring and viton O-ring; firing pin chromed finished with firing pin retaining pin and cam pin.

HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected).

Complete Mil-Spec M-16 Bolt Carrier with Bolt Assembly HPT/MPI Tested:

  • Mil-Spec BCG Machined from 8620 Aircraft Quality Steel and heat treated to 60-61 RC
  • Mil-Spec Chrome Lined Carrier Interior
  • Mil- Spec Chrome Lined Gas Key
  • Key Staked with Grade 8 Screws, per Mil-Spec
  • Mil-Spec Carpenter 158® Bolt w/ Spring and Ejector
  • Tool Steel Extractor w/ Spring and viton O-ring
  • Mil-Spec Firing Pin w/ Chrome Finish
  • Mil-Spec Cam Pin
  • Full Auto Carrier (Backward compatible with all semi-auto rifles)
  • BCG Weight – 11.55 oz.
SKU: SVP-BLK-556-BCG Categories: , ,