The KAK AR-15 Bolt Carrier Group in black (KAK Industry part no. 425-0512-019) is an M16-profile BCG built to run .224 Valkyrie and 6.8 SPC, treated with the same chrome-lined, phosphate-coated (CLP) finish KAK uses across its M16-profile BCG line for wear and corrosion protection. The bolt is machined from 9310 tool steel and the carrier from 8620 steel, both shot-peened and magnetic-particle inspected (MPI) to check for stress cracks before the group ever reaches a rifle. It’s a straightforward, reliable BCG upgrade for these less common AR-15 chamberings.

Key Specifications

• Compatible with .224 Valkyrie and 6.8 SPC.
• Cut to the M16 carrier profile, machined from 8620 steel.
• Bolt machined from 9310 steel, shot-peened and magnetic-particle inspected (MPI) for reliability.
• Treated with a chrome-lined, phosphate-coated (CLP) finish, the same coating combination KAK uses across its M16-profile BCG line.
• Firing pin machined to mil-spec from 8740 steel.
• Finished in black.

Frequently Asked Questions

What calibers does this BCG work with? It’s built to run .224 Valkyrie and 6.8 SPC.

What coating does it use? It uses KAK’s chrome-lined, phosphate-coated (CLP) finish, the same coating combination used across KAK’s M16-profile BCG line, for wear and corrosion protection.

What quality checks does KAK perform on this BCG? The bolt is shot-peened and magnetic-particle inspected (MPI) to check for stress cracks before assembly.

Buy the KAK AR-15 Bolt Carrier Group, .224 Valkyrie/6.8 SPC

Order this BCG from our Lubbock, Texas gun shop for fast, insured shipping right to your door. Shop the full KAK Industry lineup or browse our complete AR bolt carrier groups selection.