T/C Hawken is not a reliable pattern for authenticity
The T/C Hawken was designed in the 1970s, when there was much less emphasis on authenticity. It is only a rough approximation of a Hawken or of a mid-19th-century percussion rifle. Many compromises were made in its design. Study original rifles for authentic details rather than treating T/C features (including the extra trigger-guard finger hook) as historic.