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M16 Mil-Spec Mp Bolt Carrier Group - Brn M16 Bolt Carrier Group, Mpi Inspected, C158 Steel, Po4
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$141.99
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SKU: 078000250
Overview
This complete bolt carrier group is built for AR-15/M16 setups that need a fully assembled M16-pattern component ready for installation. It includes the bolt, carrier, gas key, firing pin, cam pin, and firing pin retaining pin, with the bolt MPI inspected and high pressure tested for added verification. The bolt is machined from Carpenter 158 steel, then heat treated and shot peened, while the carrier is machined from hardened 8620 steel and finished in matte black phosphate. It is designed to function in semi-auto or full-auto applications, making it a practical choice for builders and shooters who want a complete, spec-oriented assembly from Brownells.
Why Hunters Choose the Brownells
Complete Bolt
Carrier group includes bolt, carrier,
Every Bolt
Is magnetic particle inspected and
Bolt Is
Machined from Carpenter 158 steel,
M16 Carrier
Is machined from 8620 steel
Installed Extractor
Includes a red O-ring with
Key Features
- Fully assembled M16 bolt carrier group with bolt, carrier, gas key, firing pin, cam pin, and retaining pin.
- Every bolt is magnetic particle inspected and high pressure tested.
- Bolt is machined from Carpenter 158 steel, then heat treated and shot peened.
- M16 bolt carrier is machined from 8620 hardened steel.
- Installed extractor includes a red O-ring with spring.
- Matte black phosphate finish on the M16 phosphate bolt carrier group.
Best Used For
- AR-15 or M16 owners wanting a complete, fully assembled bolt carrier group for a build or replacement
- Shooters needing an M16-pattern carrier that functions in semi-auto or full-auto AR-15/M16 setups
- Users who prefer an MPI-inspected bolt and HPT-tested specification for documented inspection steps
- Builders looking for a phosphate-finished bolt carrier group with chrome-lined interior surfaces on the phosphate version
- Hunters and range users replacing worn components with a Brownells complete bolt carrier group
Specifications
| Blade Finish | Matte black phosphate |
|---|---|
| Bolt | Carpenter 158 steel |
| Bolt Inspection | Magnetic Particle Inspected (MPI) |
| Bolt Testing | High Pressure Tested |
| Carrier | 8620 hardened steel |
| Carrier Type | M16 |
| Extractor | red o-ring with spring |
| Function | semi-auto or full-auto AR-15/M16 |
| Gas Key Screws | properly staked |
| Included Components | bolt, bolt carrier, gas key, firing pin, cam pin, firing pin retaining pin |
| Interior Lining | chrome lined on the M16 Phosphate Bolt Carrier Group only |
Pros
- Complete bolt carrier group includes bolt, carrier, gas key, firing pin, cam pin, and retaining pin.
- Every bolt is magnetic particle inspected and high pressure tested.
- Bolt is machined from Carpenter 158 steel, then heat treated and shot peened.
- M16 carrier is machined from 8620 steel and hardened.
- Installed extractor includes a red O-ring with spring.
- Functions in semi-auto or full-auto AR-15/M16 platforms.
Considerations & Trade-offs
- Includes a full bolt carrier group assembly, so it is not a stripped component and may be more than needed for a simple parts replacement.
- The phosphate finish is noted as matte black, and chrome lining is specified only for the M16 Phosphate Bolt Carrier Group interior, carrier key, and bolt carrier.
- Designed to function in semi-auto or full-auto AR-15/M16 platforms, which may be broader than some users require for a basic semi-auto build.
- The extractor includes a red o-ring with spring, a detail that supports the assembly as configured but leaves little room for tailoring those parts to personal preference.
Suggested Comparisons
- AR-15 bolt carrier groups
- M16 bolt carrier groups
- Phosphate-finished bolt carrier groups
- Semi-auto/full-auto compatible AR-15 components
Suggested Accessories
- AR-15 cleaning kit
- Bolt carrier group lubricant
- Armorer's tool
- Spare firing pin retaining pin
Frequently Asked Questions
What parts are included in this bolt carrier group?
It is a fully assembled M16 Bolt Carrier Group that includes the bolt, bolt carrier, gas key, firing pin, cam pin, and firing pin retaining pin.
What inspection and testing is listed for the bolt?
The bolt is Magnetic Particle Inspected (MPI) and High Pressure Tested, according to the provided specifications.
What materials are listed for the bolt and carrier?
The bolt is machined from Carpenter 158 steel. The carrier is machined from 8620 steel and is hardened.
Will this bolt carrier group work in a semi-auto AR-15?
Yes. The description states that the M16 Bolt Carrier will function in semi-auto or full-auto AR-15/M16 platforms.
Does the product description mention any finish or chrome lining?
Yes. The specifications list a matte black phosphate finish, and the description says the interior of the bolt carrier carrier key and bolt carrier are chrome lined on the M16 Phosphate Bolt Carrier Group only.