A firearm receiver assembly is disclosed herein. The firearm receiver assembly includes a receiver having at least two pillar apertures. The firearm receiver assembly also includes a chassis having a top portion, a bottom portion, and a side portion. The receiver is configured to be set within the top portion. The firearm receiver assembly also includes a bottom metal having a top side, a bottom side, a proximate end, and a distal end. More so, the firearm receiver assembly includes at least two integrated pillars extending from the top side of the bottom metal. The at least two integrated pillars are configured to align with the pillar apertures of the receiver.