Kak Industry 304-1002-001 Carrier Completion Kit

The Kak Industry 304-1002-001 Carrier Completion Kit gives you the internal parts you need to finish a bolt carrier group for an AR-15 or M16. Whether you're building a spare carrier, upgrading an existing one, or just want to keep replacement parts on the shelf, this kit bundles three critical components in one package: a firing pin, cam pin, and firing pin retaining pin—all to mil-spec standards.

Each component is engineered for reliability and durability. The cam pin is machined from 4140 steel, heat-treated, and finished with either hard chrome or phosphate plating for corrosion resistance and smooth operation. The firing pin is precision-ground from 8740 steel with heat treatment and hard chrome plating to withstand repeated strike forces. The firing pin retaining pin rounds out the kit with mil-spec phosphate coating. Together, these parts ensure consistent ignition and reliable function in your carrier.

This is the kind of kit you pair with your own AR-15 bolt to complete a carrier, or keep as a backup set if a component wears or fails. Since these are the moving parts at the heart of the firing sequence, having quality spares or a complete set for a build matters. Kak Industry's attention to material selection and heat treatment reflects that importance.

Key Features

• Complete firing pin assembly and cam pin—everything needed to finish a bolt carrier group except the bolt itself
• Cam pin machined from 4140 steel, heat-treated and hard chrome or phosphate plated
• Precision-ground 8740 steel firing pin with hard chrome plating for durability
• Mil-spec firing pin retaining pin with phosphate coating
• Compatible with AR-15 and M16 platforms

Specifications

Frequently Asked Questions

What's included in this carrier completion kit?

The Kak Industry kit contains three parts: one mil-spec firing pin (8740 steel, hard chrome plated), one cam pin (4140 steel, available with hard chrome or phosphate finish), and one phosphate-coated firing pin retaining pin. These are the internal components you need to finish a bolt carrier group.

Will this kit work with my AR-15 bolt?

Yes, this kit is designed for AR-15 and M16 platforms. You'll pair these components with your own AR-15 bolt to complete a carrier.

What's the difference between hard chrome and phosphate plating on the cam pin?

Both finishes protect against corrosion and wear. Hard chrome offers a harder, smoother surface and greater corrosion resistance. Phosphate is a traditional mil-spec finish that's durable and cost-effective. The choice often comes down to personal preference and intended use.

Is this kit suitable as a spare or backup?

Absolutely. Many shooters keep extra firing pins, cam pins, and retaining pins on hand for maintenance or as backup parts. This kit provides all three in one convenient package.