A detachable chassis base for a tactical rifle is presented. The lower chassis receiver assembly can have a detachable chassis base that substantially selectively attaches to the chassis receiver interface. The detachable chassis base can be completely removable, or it can be hingedly attached to provide access without completely removing the chassis base, or a combination thereof. Multiple combinations of parts included in the detachable chassis base are possible. Several variations and combinations are illustrated herein, although others are contemplated.