KAK K-SPEC Low Mass BCG - NP3 Finish C158 Bolt and 4140 Cam Pin - Gold Anodized

KAK K-SPEC Low Mass BCG - NP3 Finish C158 Bolt and 4140 Cam Pin - Gold Anodized

When your build demands uncompromising performance across all conditions—suppressed or unsuppressed—the K-SPEC Bolt Carrier Group delivers. Designed as a consumable, high-performance component, this BCG is not for “hard use” abuse, but for shooters who value precision engineering, gas system harmony, and mission-adaptable reliability.

Crafted from 7075 aircraft-grade aluminum and finished in a striking Satin Gold Anodize, the K-SPEC is built for smooth cycling and reduced fouling. Its dual ejector C158 bolt, NP3-coated cam pin, and downward gas venting system work in unison to minimize blowback, enhance ejection consistency, and keep your face clear of gas—even when running suppressed.

Whether you're operating in dusty terrain, muddy fields, or high-pressure suppressed setups, the K-SPEC’s slotted angled carrier rails and sandcutter-style debris channels ensure ultra-reliable function. This is a plug-and-play solution for AR15-style platforms with mid-length or rifle-length gas systems, requiring no tuning to run suppressed.

K-SPEC Design
Optimized for both suppressed and unsuppressed use—no tuning required.

Downward Gas Vents
Redirects gas away from the shooter’s face for a cleaner, quieter experience.

Dual Ejector System
Uses mil-spec components for consistent ejection and enhanced reliability.

Slotted Angled Carrier Rails
Cuts through sand, mud, and fouling for flawless function in harsh environments.

Full Auto Profile
Machined to M16 specs for durability and compatibility.

Premium Materials & Finishes
NP3, chrome, phosphate, and anodized finishes ensure corrosion resistance and smooth operation.

In-House Precision Manufacturing
Built 100% in Missouri using advanced CNC and robotic automation for unmatched quality control.

Specifications

• Carrier Material: 7075 Aircraft Grade Aluminum
• Carrier Finish: Satin Gold Anodize (Mil-Spec Buffer Tube Color)
• Bolt Material: C158 Steel, Shot Peened, MPI Tested
• Bolt Finish: NP3 Coated
• Cam Pin: 4140 Steel, NP3 Finish
• Firing Pin: 8740 Steel, Chrome Plated
• Extractor: 4140 Steel, Phosphate Coated
• Extractor Pin: S7 Tool Steel, Heat Treated
• Ejectors: Dual S7 Tool Steel, Heat Treated
• Gas Key: 4130 Steel, Chrome Finish, T25 Torx Fasteners, Hydraulic Staked
• Rail Cuts: Angled “Sandcutter” Style for Debris Disbursement
• Gas Venting: Downward Ports + Emergency Relief Ports
• Weight: 6.2 oz
• Recommended Gas Systems: Mid-Length, Rifle-Length, or Similar
• Compatibility: AR15-Style Platforms (Not MIL-SPEC AR10)
• Durability Note: Not a “hard use” BCG; lifespan depends on gas/buffer tuning