Bolt Parts2A ArmamentSold by Brownells

2A Armament

Ar-15 Bolt Carrier Group Lightweight Adjustable - Ar-15 Bolt Carrier Group Adjustable

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

Lightweight Regulated

Bolt carrier for AR-15 gas

Built-in Gas

Regulating gate eliminates the need

Infinite Adjustment

From fully open to fully

Fully Adjustable

Through the port door without

Can Be

Tuned to combinations of buffers,

$312.99
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SKU: 100019804

Overview

Built for shooters who want a lighter, tuneable operating setup, this regulated bolt carrier offers an integrated gas adjustment system in a drop-in format. It is intended for AR-15 owners looking to dial in their rifle across different buffer, spring, suppressor, and barrel-length combinations without relying on an adjustable gas block. Adjustment is made through the port door, so changes can be handled without breaking the firearm down. For hunters and field users who value a configurable setup, the trade-off is added adjustment complexity in exchange for easier system tuning and a path back to a full-mass carrier when desired.

Why Hunters Choose the 2A Armament

Lightweight Carrier

Design supports a reduced-mass AR-15

Built-in Gas

Regulating gate eliminates the need

Infinite Adjustment

From fully open to fully

Fully Adjustable

Through the port door without

Can Be

Tuned to combinations of buffers,

Key Features

  • Lightweight regulated bolt carrier for AR-15 gas system tuning
  • Built-in gas regulating gate eliminates the need for adjustable gas blocks
  • Infinite adjustment from fully open to fully closed
  • Fully adjustable through the port door without breaking down the firearm
  • Can be tuned to combinations of buffers, springs, suppressors, and barrel lengths
  • Restores to a factory full-weight system by swapping in a full-mass carrier

Best Used For

  • AR-15 owners wanting a drop-in option for gas tuning without changing the gas block
  • Shooters using suppressors, buffers, springs, or varied barrel lengths in one setup
  • Users who want adjustment through the port door without breaking down the firearm
  • Owners seeking a lightweight carrier that can be swapped back to a full-mass carrier

Specifications

AdjustableYes
Adjustable Gas Block RequiredNo
Adjustment RangeFully open to fully closed
Compatible PlatformAR-15
Drop InYes
Full Mass Carrier SwapYes
Fully Adjustable Through Port DoorYes
Gas Regulating GateBuilt into the carrier itself
Infinite AdjustmentYes
LightweightYes
ModelRegulated Bolt Carrier (RBC)
Product TypeBolt Carrier Group
Requires Firearm DisassemblyNo
Restores To Factory Full Weight SystemYes
Tunable With Barrel LengthsYes
Tunable With BuffersYes
Tunable With SpringsYes
Tunable With SuppressorsYes

Pros

  • Lightweight carrier design supports a reduced-mass AR-15 setup.
  • Built-in gas regulating gate eliminates the need for adjustable gas blocks.
  • Infinite adjustment from fully open to fully closed on the regulating gate.
  • Fully adjustable through the port door without breaking down the firearm.
  • Can be tuned to combinations of buffers, springs, suppressors, and barrel lengths.
  • Swap back to a full-mass carrier to restore factory full-weight configuration.

Considerations & Trade-offs

  • Tuning is required to get the most from the regulated carrier; it is not a drop-in part that automatically suits every setup out of the box.
  • Its lightweight design is a trade-off versus a full-mass carrier, so users who prefer a standard configuration may want to keep the original carrier on hand.
  • The gas regulating gate is adjusted through the port door, which is convenient, but it also means changes are made at the carrier rather than with an adjustable gas block.
  • Compatibility is described in broad terms for buffers, springs, suppressors, and barrel lengths, so final setup still depends on the specific rifle configuration.

Suggested Comparisons

  • Standard AR-15 bolt carrier group
  • Adjustable gas block
  • Full-mass bolt carrier group
  • AR-15 buffer and spring setup

Suggested Accessories

  • AR-15 cleaning kit
  • Lubricant/oil
  • Spare bolt carrier group
  • Armorer's tool

Frequently Asked Questions

What is the main purpose of the Regulated Bolt Carrier (RBC)?

It is a lightweight AR-15 bolt carrier with a built-in gas regulating gate, designed as a drop-in solution for tuning the rifle’s gas system.

Does this carrier replace the need for an adjustable gas block?

According to the product description, yes. It is intended to eliminate the need for adjustable gas blocks.

How is the RBC adjusted?

The RBC has infinite adjustment from fully open to fully closed on the regulating gate, and it is fully adjustable through the port door.

Do I need to break down the firearm to adjust it?

No. The description says it does not require the firearm to be broken down for adjustment.

Can the rifle be returned to a factory full-weight setup after using this carrier?

Yes. The description says the firearm can be restored to a factory full weight system by swapping back to a full-mass carrier.