A firearm chassis comprises a body having a receiver mount for receiving a firearm receiver or barreled action, and one or more mounting rails configured to removably accept one or more firearm features, wherein the mounting rails may comprise integrated Picatinny, Weaver or ARCA Swiss style rails, such as in vertical and/or horizontal orientations at the front and/or rear of the chassis. A firearm chassis may also be uniquely configured to utilize identical front and rear actions screws for attaching the firearm receiver or a barreled action thereto.