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
M.A.S. Model 1938 Submachine Gun
This blowback-operated submachine gun employs some unusual features. Among these are a folding trigger which, when pushed forward, acts as a safety mechanism. The stock is also removable, and the gun cannot be fired under this condition. In addition, the bolt travels at an angle relative to the plane of the barrel. Roughly equivalent to a .32 ACP cartridge, the 7.65 mm MAS caliber ammunition used in this gun is now obsolete. During its service life, it was only manufactured at arsenals in France and Vietnam.