BCG Upgrades Explained: First or Last Priority?
This discussion from AT3 Tactical explores the priority and impact of upgrading a Bolt Carrier Group (BCG) on an AR-15. While easy to install, the measurable improvement from a standard BCG upgrade is often minimal unless building a precision-focused rifle or opting for specialized lightweight carriers. For most users, other components offer a higher return on investment. Ensuring a bolt is MPI (Magnetic Particle Inspected) is crucial for quality control.











