Kak Ar15 Bcg M16 556/300 Clp Blk

The Kak Industry AR-15 BCG M16 5.56/300 in black is a chrome-lined phosphate-finished bolt carrier group built for shooters who demand reliability without the premium price tag. This is a true workhorse — the kind of part that runs whether you're putting rounds downrange at the range, building a patrol rifle, or trusting it in a duty setup. Kak has engineered this BCG with the same attention to detail as their higher-end offerings, but positioned it as the dependable, no-nonsense choice for builders and shooters tired of paying unnecessary markups for proven performance.

Every component is purpose-built for longevity and consistent function. The carrier itself is machined from 8620 steel with proper heat treatment and ground to exact tolerances, and it features the M16 (full-auto) profile carrier — the same platform that's been proven in military and civilian service for decades. The single-piece billet-machined 4140 extractor is phosphate coated to resist corrosion and wear. Hard chrome plating on the 4340 cam pin and 8740 firing pin adds toughness where it matters most, while S7 tool steel pins handle the job of keeping everything where it belongs. The gas key is machined from 4130 billet steel, chrome lined and plated, then precision staked to spec. Even the carrier key screws are Grade 8 and properly heat treated — Kak doesn't cut corners on the small stuff.

Whether you're assembling an entry-level 5.56 build, upgrading a rifle you already trust, or stocking up, this BCG brings no-drama reliability to the job. The phosphate finish resists corrosion in field conditions, the chrome lining keeps things running smooth, and the 8620 carrier backbone is time-tested. This is the BCG that works quietly and doesn't ask for attention — exactly what you want from a critical part.

Key Features

• Chrome-lined phosphate finish for corrosion resistance and reliable function
• M16 full-auto carrier profile machined from 8620 steel with precision heat treatment
• Single-piece billet-machined 4140 extractor, phosphate coated
• Hard chrome-plated 4340 cam pin and 8740 firing pin for durability
• S7 tool steel ejector and extractor retaining pins for long service life
• 4130 billet steel gas key, chrome lined and plated, precision staked
• Grade 8 carrier key screws with T25 drive, properly heat treated
• Fits AR-15 platform rifles chambered in 5.56 NATO and .300 Blackout

Specifications

Frequently Asked Questions

What AR-15 calibers does this BCG work with?

This bolt carrier group is compatible with 5.56 NATO and .300 Blackout chambered AR-15 rifles. Both are direct impingement rifle cartridges that cycle reliably with the M16 carrier profile.

Is this BCG full-auto rated?

This BCG features the M16 full-auto carrier profile, which is the military-spec design. The profile itself is the same as used in selective-fire platforms, though the BCG is sold as a civilian component and is legal for civilian use in semi-auto rifles.

What's included with the BCG?

The bolt carrier group comes complete with all components: carrier, bolt (extractor and firing pin), cam pin, ejector, retaining pins, and gas key with screws. It's ready to install into a complete upper receiver.

Why chrome-lined phosphate instead of full hard chrome?

Chrome-lined phosphate finish delivers excellent corrosion resistance and reliable function at a practical price point, making it the right choice for the working shooter who values dependability over cosmetics. The phosphate coating protects the steel while the chrome lining keeps the bolt running smooth without unnecessary cost.