User Ratings
No ratings yet
Be the first to review this product
Product Description
The KAK Industry K-SPEC Bolt Carrier Group (BCG) is designed to increase reliability in AR-15 style rifles across a wide range of conditions, whether running suppressed or unsuppressed. Built as a plug-and-play upgrade, this enhanced BCG incorporates features intended to improve function and durability, including dual ejectors, angled carrier rail cuts, and downward (down-vent) gas ports. Finished in NP3 for a sleek silver appearance and reduced friction.
Product Highlights
- K-SPEC enhanced AR-15 bolt carrier group engineered for dependable cycling suppressed or unsuppressed
- Dual ejectors help promote positive and consistent case ejection
- Downward (down-vent) gas ports and angled carrier rail cuts to support reliability-focused operation
- NP3 finish in silver for corrosion resistance and smoother action
- Full-auto profile carrier with 9310 steel bolt for strength and longevity
Specs
- Brand: KAK Industry
- Model: K-SPEC
- Product Type: Bolt Carrier Group
- Platform: AR-15
- Compatible Calibers: 5.56 NATO / 300 Blackout
- Bolt Material: 9310 Steel
- Finish: NP3
- Color: Silver
- Profile: Full Auto
- Key Features: Dual ejectors; angled carrier rail cuts; downward gas ports
- UPC: 811163035583
- Manufacturer Part Number: 425-0506-003
Specifications
- Manufacturer:
- KAK Industry
- Category:
- bolt-carrier-group
- Caliber:
- 5.56x45mm NATO
- Platforms:
- AR-15
- MPN:
- 425-0506-003
- Required Component:
- Yes
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Have one to sell?
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$229.98
Lowest
$229.98
Highest
$238.98
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertSimilar Products

BCM MPI Bolt Carrier Group, M16 Profile, Black
Bravo Company Manufacturing (BCM)
$238.99

PSA Freedom AR-15 Nitride Bolt Carrier Group With Carpenter 158 Bolt
Palmetto State Armory
$99.99

BCM MPI Bolt Carrier Group, M16 Profile, Flat Dark Earth
Bravo Company Manufacturing (BCM)
$267.99
Microbest PSA Fathers of Freedom 5.56 Full-Auto Phosphate Bolt Carrier Group
Microbest
$134.95

Aero Precision 5.56 Complete Bolt Carrier Group, Nickel Boron (APRH100071C)
Aero Precision
$188.99

Toolcraft Logo'd Premium 5.56 Nickel Boron Bolt Carrier Group, Carpenter 158 Bolt
Toolcraft
$119.99

Sons of Liberty Gun Works 5.56 NATO AR-15 Bolt Assembly, Black
Sons of Liberty Gun Works
$104.07

Toolcraft Non-Logo Premium 5.56 Nickel Boron Bolt Carrier Group, Carpenter 158 Bolt
Toolcraft
$109.99
Related Guides
Guide
.308 Win vs. 6.5 Creedmoor for AR-10 Builds
A technical comparison of .308 Winchester and 6.5 Creedmoor for AR-10 platform builds — covering ballistics, recoil, parts availability, and which cartridge fits which use case.
5 min read
Guide
AR-10 Receiver Patterns: DPMS vs. Armalite Compatibility
The AR-10 has two incompatible receiver patterns — DPMS and Armalite — that look similar but do not share parts. This guide explains the differences and how to buy correctly.
6 min read
Guide
The AR-10 Platform: What It Is and How It Differs from the AR-15
A practical overview of the AR-10 — its origins, how it differs from the AR-15, available calibers, and when it makes more sense than a standard AR-15 build.
6 min read