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LANTAC M-SPEC Bolt Carrier Group (BCG) Up to 10% Off w/ Free Shipping — 2 models

LANTAC M-SPEC+ Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
LANTAC M-SPEC Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
LANTAC M-SPEC+ Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
LANTAC M-SPEC+ Bolt Carrier Group BCG, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
LANTAC M-SPEC+ Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
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LANTAC M-SPEC+ Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
LANTAC M-SPEC Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
2 of 4 images
LANTAC M-SPEC Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
LANTAC M-SPEC+ Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
3 of 4 images
LANTAC M-SPEC+ Bolt Carrier Group, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
LANTAC M-SPEC+ Bolt Carrier Group BCG, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG
4 of 4 images
LANTAC M-SPEC+ Bolt Carrier Group BCG, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG

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Questions & Answers
Is this for an AR10 or AR15? Manufacturer Answer

There is a 5.56/.223 version and a 7.62/.308 version.

by Lantac, Manufacturer, February 19, 2025
Is the interior of the bolt chrome lined? Expert Answer

No. The LANTAC M-SPEC Bolt Carrier Group is manufactured from 8620 steel, case hardened and hard turned/ground so that internal dimension is exact to mil specifications. It is then QPQ Nitrided rather than Type M Phosphated to give increased corrosion resistance, durability and performance. The Bolt is machined from Carpenter 158 or 9310, shot peened and hard turned as per the military spec. Each BCG is further fitted with a Lantac CP-R360 domed head cam pin, which are precision machined from 17-4PH stainless steel, hand polished and hardened to H900 condition, this further reduces friction and wear within the upper receiver.

by Ethan, Gear Expert, June 7, 2023
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Lantac Mil Spec BCG by Dan, Verified Owner, November 4, 2021
Look no further purchased two and they are amazing suppressed or not working every time , great finish decent priced .Has a C158 bolt that will eat anything you have , upgraded cam pin and nitrade finish for smooth op.
3/3 found this helpful
Helpful Positive Review
Lantac Mil Spec BCG by Dan, Verified Owner, November 4, 2021
Look no further purchased two and they are amazing suppressed or not working every time , great finish decent priced .Has a C158 bolt that will eat anything you have , upgraded cam pin and nitrade finish for smooth op.
2/3 found this helpful
Helpful Positive Review
So far so good by Antonio, January 10, 2022
I have been able to Put about 400 rounds through this BCG and it hasn't skipped a beat. The Gas key staking is decent. The machining and nitride finish are very nice, the domed ss cam pin is definitely a nice touch. I would buy another one.
3/3 found this helpful
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LANTAC BCG by Travis K., Verified Owner, April 17, 2026
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Lantac M-SPEC BCG by johnchip, Verified Owner, December 9, 2025
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Product Info for LANTAC M-SPEC Bolt Carrier Group (BCG)

Offered in both 5.56/.223 and 7.62/.308 Caliber, the Lantac M-SPEC 5.56/.223 BCG is precision machined to milspec dimensions and tolerances. The carrier is full auto style with increased mass and is manufactured from 8620 steel, case hardened and hard turned/ground so that internal dimension are exact to mil specifications. It is then QPQ Nitrided rather than Type M Phosphated to give increased corrosion resistance, durability and performance.image

The Bolt is machined from Carpenter 158, shot peened and hard turned as per the military spec.

Each BCG is further fitted with a Lantac CP-R360 domed head cam pin, which are precision machined from 17-4PH stainless steel, hand polished and hardened to H900 condition, this further reduces friction and wear within the upper receiver.

The M-SPEC line of products are ideal for budget builds where quality and reliability are still paramount.

WARNING: California`s Proposition 65

Specifications for LANTAC M-SPEC Bolt Carrier Group (BCG):

Manufacturer: LANTAC
Color: Black
Finish: QPQ Nitride
Fabric/Material: 17-4PH Stainless Steel, 8620 Steel
Carrier Material: 8620 Steel
Bolt Material: Steel
Gun Model: AR-15
Condition: New

Features of LANTAC M-SPEC Bolt Carrier Group BCG

  • 8620 Carrier, Heat Treated, Hard Turned Ground.
  • MPI Carpenter 158 Bolt, Shot Peened, Hard Turned / Ground.
  • QPQ Nitride Finish.
  • CP-R360 Domed Cam Pin
  • Shot Peening is conducted with S110 shot, Established by Almen Gage A-2 strip .006 -.008
  • Lifetime Warranty.

Package Contents:

  • LANTAC M-SPEC Bolt Carrier Group

What firearm models does the manufacturer say LANTAC M-SPEC Bolt Carrier Group (BCG) is compatible with?

The manufacturer suggests that LANTAC M-SPEC Bolt Carrier Group (BCG) is compatible with AR-15

LANTAC M-SPEC Bolt Carrier Group (BCG) Orderable Models

List of Orderable Models

  • LANTAC M-SPEC Bolt Carrier Group BCG, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG , MPN: 01-MSPEC-556-NIT-BCG , UPC: 711841794095 , Code: 2D0-BCG-MSPECBCG-01-MSPEC-556-NIT-EBCG
  • LANTAC M-SPEC Bolt Carrier Group BCG, 7.62x51mm NATO/.308, Nitride Finish, 8620 Steel, Black, 01-MSPEC-762-NIT-EBCG , MPN: 01-MSPEC-762-NIT-BCG , UPC: 711841794101 , Code: 2D0-BCG-MSPECBCG-01-MSPEC-762-NIT-EBCG

LANTAC M-SPEC Bolt Carrier Group (BCG) Unavailable & Discontinued Models

List of Unorderable Models

  • DEMO, LANTAC M-SPEC Bolt Carrier Group BCG, 5.56x45mm NATO/.223, Nitride Finish, 8620 Steel, Black, 01-MSPEC-556-NIT-EBCG , MPN: 01-MSPEC-556-NIT-EBCG-DEMO , Code: 2D0-BCG-MSPECBCG-01-MSPEC-556-NIT-EBCG-DEMO
  • USED, LANTAC M-SPEC Bolt Carrier Group BCG, 7.62x51mm NATO/.308, Nitride Finish, 8620 Steel, Black, 01-MSPEC-762-NIT-EBCG , MPN: 01-MSPEC-762-NIT-BCG-EDEMO , Code: 2D0-BCG-MSPECBCG-01-MSPEC-762-NIT-EBCG-EDEMO-IN-C
  • DEMO, LANTAC M-SPEC Bolt Carrier Group BCG, 7.62x51mm NATO/.308, Nitride Finish, 8620 Steel, Black, 01-MSPEC-762-NIT-EBCG , MPN: 01-MSPEC-762-NIT-EBCG-DEMO , Code: 2D0-BCG-MSPECBCG-01-MSPEC-762-NIT-EBCG-DEMO
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