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KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group Up to 25% Off w/ Free S&H — 9 models

Special offer available for this product. Click here to see!
KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, 303-0502-011
KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, 303-0502-011
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, PVD, Flat Dark Earth, 425-0507-003
KAK Industry K-SPEC Enhanced Bolt Carrier Group AR-15, 5.56/ 300 Blackout, Dual Ejector, Down Vent, Sand Cuts, Black, Phosphate, 425-0512-003
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Phosphate, Black, 425-0512-003
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, C158 Steel, Phosphate, Black, 425-3312-001
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Chrome, Silver, 425-0505-002
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Hard Chrome, Silver, 425-0505-003
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, NP3, Silver, 425-0506-003
KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, Anodize and NP3, 425-0510-002
KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, 303-0502-011
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KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, 303-0502-011
KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, 303-0502-011
2 of 10 images
KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, 303-0502-011
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, PVD, Flat Dark Earth, 425-0507-003
3 of 10 images
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, PVD, Flat Dark Earth, 425-0507-003
KAK Industry K-SPEC Enhanced Bolt Carrier Group AR-15, 5.56/ 300 Blackout, Dual Ejector, Down Vent, Sand Cuts, Black, Phosphate, 425-0512-003
4 of 10 images
KAK Industry K-SPEC Enhanced Bolt Carrier Group AR-15, 5.56/ 300 Blackout, Dual Ejector, Down Vent, Sand Cuts, Black, Phosphate, 425-0512-003
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Phosphate, Black, 425-0512-003
5 of 10 images
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Phosphate, Black, 425-0512-003
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, C158 Steel, Phosphate, Black, 425-3312-001
6 of 10 images
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, C158 Steel, Phosphate, Black, 425-3312-001
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Chrome, Silver, 425-0505-002
7 of 10 images
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Chrome, Silver, 425-0505-002
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Hard Chrome, Silver, 425-0505-003
8 of 10 images
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Hard Chrome, Silver, 425-0505-003
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, NP3, Silver, 425-0506-003
9 of 10 images
KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, NP3, Silver, 425-0506-003
KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, Anodize and NP3, 425-0510-002
10 of 10 images
KAK K-SPEC Low Mass AR15 Bolt Carrier Group, Dual Ejectors, Down Vent, Sand Cuts, Anodize and NP3, 425-0510-002

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Questions & Answers
The weight of this bcg was never stated so would like to know. Expert Answer

The KAK K-SPEC Low Mass AR15 BCG weighs 6.2 oz.

by Ethan, Gear Expert, April 9, 2025
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Negative Review
Don't buy the Nitride Finish by shep, Verified Owner, December 25, 2025
The coating is so bad that it's essentially a sandpaper-coated BCG. The coating is also not applied adequately on the gas key. I don't have to tools to check if it's out of spec but it's the only BCG I've ever had to use the Forward Assist on straig...
Read More...
3/4 found this helpful
Most Recent Reviews
Great quality by FdeRob, Verified Owner, June 9, 2026
This product delivers all the extras for half the price. Machining, finish and properly staked. You wont find a better carrier and especially at this price.
Most Recent Reviews
Do Not Buy Minus 5 stars by DARYL DIXON, Verified Owner, April 22, 2026
I waited too long {60 days} to test this bolt. I know have another paperweight on my desk. I should have read the reviews but I should have suspected this was a dud since the gas rings looked oversized and warped out the box. I thought maybe OP ...
Read More...
Most Recent Reviews
4th BCG from KAK — Still the Only Brand I Trust for High-End Suppressed Builds by ReeceDOA, Verified Owner, March 20, 2026
This is my fourth bolt carrier group from KAK Industry, and they continue to earn every bit of my trust. I build suppressed, high-end competition rifles and the components I spec have to perform under real pressure 2000+round weekends — there’s no r...
Read More...
Read All 4 Reviews
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Product Info for KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group

The K-SPEC BCG combines multiple key features focused on increasing the reliability of your AR-15 style firearm no matter if you are running suppressed or unsuppressed, and regardless of conditions. The K-SPEC is a truly plug and play BCG that will accommodate whatever configuration your mission requires.image

Specifications for KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group:

Manufacturer: KAK Industry
Caliber: 5.56mm, .300 AAC Blackout
Gun Make: AR Platform
Gun Model: AR-15
Hand: Right

Features of KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group

  • Dual Ejectors
  • Angled Carrier Rail Cuts
  • Downward Gas Ports
  • Full Auto Profile

Package Contents:

  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group

What firearm models does the manufacturer say KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group is compatible with?

The manufacturer suggests that KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group is compatible with AR-15

KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group Orderable Models

List of Orderable Models

  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, C158 Steel, Phosphate, Black, 425-3312-001 , MPN: 425-3312-001 , Code: 3KE-BCG-K-SPEC-425-3312-001
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, PVD, Flat Dark Earth, 425-0507-003 , MPN: 425-0507-003 , UPC: 811163035699 , Code: 3KE-BCG-K-SPEC-425-0507-003
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, NP3, Silver, 425-0506-003 , MPN: 425-0506-003 , Code: 3KE-BCG-K-SPEC-425-0506-003
  • KAK K-SPEC Low Mass AR15 BCG, Dual Ejectors, Down Vent, Sand Cuts, Anodize and NP3, 425-0510-002 , MPN: 425-0510-002 , UPC: 811163036061 , Code: 3KE-BCG-K-SPEC-425-0510-002
  • KAK K-SPEC Low Mass AR15 BCG, Dual Ejectors, Down Vent, Sand Cuts , MPN: 303-0502-011 , UPC: 811163035743 , Code: 3KE-BCG-K-SPEC-303-0502-011
  • USED, KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, PVD, Flat Dark Earth, 425-0507-003 , MPN: 425-0507-003-EDEMO , Code: 3KE-BCG-K-SPEC-425-0507-003-EDEMO-US-C
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Phosphate, Black, 425-0512-003 , MPN: 425-0512-003 , UPC: 811163034982 , Code: 3KE-BCG-K-SPEC-425-0512-003
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Dual Ejector, Side Vent, Sand Cuts, Full Chrome, Silver, 425-0505-003 , MPN: 425-0505-003 , UPC: 811163035088 , Code: 3KE-BCG-K-SPEC-425-0505-003
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Chrome, Silver, 425-0505-002 , MPN: 425-0505-002 , Code: 3KE-BCG-K-SPEC-425-0505-002

KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group Unavailable & Discontinued Models

List of Unorderable Models

  • USED, KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, Chrome, Silver, 425-0505-002 , MPN: 425-0505-002-EDEMO , Code: 3KE-BCG-K-SPEC-425-0505-002-EDEMO-IN-D
  • USED, KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group, 9310 Steel, PVD, Flat Dark Earth, 425-0507-003 , MPN: 425-0507-003-EDEMO , Code: 3KE-BCG-K-SPEC-425-0507-003-EDEMO-IN-C
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group , MPN: MO-425-0512-015 , UPC: 811163035033 , Code: 3KE-BCG-K-SPEC-MO-425-0512-015
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group , MPN: MO-425-0512-017 , UPC: 811163036016 , Code: 3KE-BCG-K-SPEC-MO-425-0512-017
  • DEMO, KAK K-SPEC Low Mass AR15 BCG, Dual Ejectors, Down Vent, Sand Cuts, Anodize and NP3, 425-0510-002 , MPN: 425-0510-002-DEMO , Code: 3KE-BCG-K-SPEC-425-0510-002-DEMO-OB-A
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group , MPN: MO-425-3305-006 , Code: 3KE-BCG-K-SPEC-MO-425-3305-006
  • KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group , MPN: MO-425-3305-007 , Code: 3KE-BCG-K-SPEC-MO-425-3305-007
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