The Galleries
- Robert E. Petersen Collection
- Ancient Firearms
- The Road to American Liberty
- Seeds of Greatness
- The Prospering New Republic
- A Nation Asunder
- The American West
- Innovation, Oddities and Competition
- Theodore Roosevelt, Elegant Arms
- World War I and Firearms Innovation
- WWII, Korea, Vietnam and Beyond
- For the Fun of It
- Firearms Traditions for Today
- William B. Ruger Special Exhibits
- Freedom's Doorway
Richardson & Overman Gallagher Carbine
Although inventor Mahlon J. Gallagher was a native South Carolinian, over 23,000 Gallagher carbines manufactured in Philadelphia during the Civil War for issue to Federal cavalry units.