BCM Bolt Carrier Group (MPI) – Auto BCG
$170.00
Now Available!
Legal To Own And Purchase!
Prices are discounted until the end of: 11th August 2026
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The BCM Bolt Carrier Group (MPI) Auto BCG is a fully assembled, full-auto-profile bolt carrier group from Bravo Company Manufacturing, built for AR-15, M16, and M4 rifles. This bcm bolt carrier group is machined to USGI specifications, HPT and MPI tested, and test-fired before shipping, so it drops in ready to run alongside the rest of our AR-15 bolt carrier groups and trigger parts.
An M16-profile bolt carrier is a machine gun part, not a firearm, and its sale and possession are unregulated by federal firearms law. It is legal to run an M16 bolt carrier in a semi-automatic AR-15-type rifle. Always follow your state and local laws, and you must be of legal age and eligible to purchase.
Specifications and fitment
| Spec | Detail |
|---|---|
| Profile | Full-auto (M16) carrier profile |
| Fitment | AR-15, M16, and M4 platforms |
| Carrier finish | Parkerized exterior, chrome-lined interior |
| Bolt material | Mil-spec Carpenter No. 158 steel, shot peened |
| Gas key | Chrome-lined, heat-treated, Grade 8 fasteners, properly staked |
| Extractor / ejector | Tool steel, with BCM extractor spring |
| Testing | HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected), test-fired |
| Manufacturer | Bravo Company Manufacturing (BCM) |
USGI-spec reliability from BCM
Bravo Company builds this carrier group to the same standards as a duty rifle. The bolt is made from the correct Carpenter No. 158 steel and shot peened for strength, the gas key is staked with USGI domestic Grade 8 fasteners, and every group is HPT and MPI tested. Because each BCG is test-fired during quality control, it may arrive with light handling marks consistent with that process. It anchors the same quality bar you will see across our full AR-15 trigger range.
Frequently asked questions
Is an auto BCG legal in my AR-15? Yes. According to the BATFE, an M16 bolt carrier is a machine gun part, not a firearm, and it is legal to use one in a semi-automatic AR-15-type rifle. The carrier profile does not change how a semi-auto rifle fires.
Why choose a full-auto profile? The heavier full-auto carrier adds mass to the reciprocating group, which many shooters find smooths cycling and improves reliability over a lightweight semi carrier.
Build a rifle that runs like a duty gun and add the BCM Bolt Carrier Group (MPI) Auto BCG to your cart today.
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