This is what 2A Armament says:
The Regulated Bolt Carrier (RBC) is a lightweight carrier with a gas regulating gate built into the carrier itself. This provides a drop in, lightweight solution for those looking to tune your AR-15's gas system. It eliminates the need for adjustable gas blocks and allows the firearm to be restored to a factory full weight system by simply swapping your full-mass carrier back into your firearm. The RBC has infinite adjustment from fully open, to fully closed on the regulating gate. The RBC can be tuned to most combinations of buffers, springs, suppressors, and barrel lengths. The RBC Is fully adjustable through the port door and does not require the firearm to be broken down for adjustment.
Carrier: 8620 steel, heat treated, QPQ Nitride
Bolt: 9310 steel, heat treated, MP, Cryo'd, QPQ Nitride
Rear body: 7075-T6, hard anodized clear
Extractor: machined, heat treated, QPQ Nitride
Carrier key: machined, heat treated, QPQ Nitride, staked screws
Regulating gate: machined from 6AL-4V Titanium
Weight: 7.9oz assembled
T-6 Torx tool supplied for adjustment
Patent No. 9,857,129
Product of the great state of Idaho, MADE IN THE U.S.A.
NOTE: Does not support the use of forward assist. Not compatible with full auto systems
COMPATIBILITY NOTICE: Some 3rd party skeletonized upper receivers have the bore surface compromised that the bolt carrier slides on. 2A Armament does not recommend the use of these upper receivers due to a non-continuous slide surface that can cause binding and cycling related issues. 2A Armament cannot guarantee flawless fit and function in a 3rd party skeletonized upper receiver.
$419.00 Regular Price