- Robert E. Petersen Collection
- Ancient Firearms - 1350 to 1700
- Road to American Liberty - 1700 to 1780
- A Prospering New Republic - 1780 to 1860
- The American West - 1850 to 1900
- Innovation, Oddities and Competition
- Theodore Roosevelt and Elegant Arms - 1880s to 1920s
- World War I and Firearms Innovation
- WWII, Korea, Vietnam and Beyond - 1940 to Present
- For the Fun of It
- Modern Firearms - 1950 to Present
- Hollywood Guns
- A Nation Asunder - 1861 to 1865
U.S. Greene Breechloading Rifle
Lt. Colonel Durrell Greene's breechloading rifle design was the first bolt-action design adopted by the US Army's Ordnance office. This rifle features an oval bore with Lancaster-style rifling. Only 900 Greene rifles were to be purchased by the US Army and delivered in March of 1863. Although other small quantities were purchased by state militia units, this design had problems with the percussion cap cone being situated underneath the barrel.
In order to fire the Green rifle, the bore had to be sealed at the back, requiring the use of two bullets per firing. Despite limited American acceptance, 3000 Greene rifles were reportedly sold to the Russian government.