TRIARC Systems Mil-Spec AR15 Bolt Carrier Group - 5.56 / 300 BLK - Black Nitride

TRIARC Systems Mil-Spec AR15 Bolt Carrier Group - 5.56 / 300 BLK - Black Nitride

Precision-machined from case hardened steels and protected with a slick Black Nitride finish, this bolt carrier group offers enhanced corrosion resistance, reduced friction, and easier maintenance compared to traditional phosphate-coated components. At the core of the system is a shot-peened, heat-treated 9310 steel bolt that is 100% MPI tested to Mil-Spec standards for proven structural integrity and long-term reliability.

The upgraded cryogenically treated 5-coil extractor spring improves extraction consistency in adverse conditions, while the billet 4140 steel extractor and hardened cam pin reinforce the system for extended service life. Combined with subdued branding and a clean professional appearance, the TRIARC Mil-Spec BCG is purpose-built for shooters who demand performance without compromise.

Full-Auto Rated Design
Engineered to withstand high-volume firing schedules and demanding operational use.

Compatible with 5.56 & .300 BLK
Versatile platform support for multiple AR15 caliber configurations.

9310 Steel Bolt Construction
Stronger-than-standard bolt material provides enhanced durability and long-term reliability.

Magnetic Particle Inspected Tested Bolt
MPI to ensure structural integrity and Mil-Spec quality assurance.

Shot-Peened & Heat-Treated Bolt
Reinforced bolt structure improves fatigue resistance and operational longevity.

Black Nitride Finish
Corrosion-resistant coating reduces friction, improves wear resistance, and simplifies cleaning.

Specifications

• Caliber Compatibility: 5.56 NATO / .300 Blackout
• Platform Compatibility: AR15
• Full-Auto Rated: Yes
• Carrier Material: Case hardened 8620 steel
• Carrier Finish: Black Nitride
• Bolt Material: Case hardened 9310 steel
• Bolt Treatment: Shot-peened and heat treated
• Bolt Inspection: 100% MPI tested
• Cam Pin Material: Hardened 4140 steel
• Firing Pin Material: 17-4 stainless steel
• Extractor Material: Billet 4140 steel
• Extractor Spring Type: Cryogenically treated enhanced 5-coil spring