All I can offer at the moment is SAAMI’s glossary definition:

Action, Rolling Block – Single shot action in which a breech block and hammer each rotate about separate transverse pins in the receiver. The two members are swung rearward, away from the barrel breech to load the mechanism or extract a cartridge case. To fire a cartridge, the breech block is closed and locking is accomplished by the falling hammer engaging an abutment under the breech block.

guns that use a rolling block action:

• . . .

 

Footnotes / Sources:

“Glossary ⇒.” Sporting Arms and Ammunition Manufacturers’ Institute. Ed. SAAMI’s Technical Committee. Web. 15-18 Jan. 2011.

 

Question:

• Do you know of a gun that uses a rolling block action?