In 1875 the Montreal City Police decided that they wanted to equip a riot squad in case of public disturbance. They initially requested funds for 50 revolvers, but this changed to 60 carbines instead, and these were purchased via broker in 1876 from the Whitneyville Armory. Whitneyville was a factory that made a variety of independently patented designs, and their rolling block design was actually protected by a different patent (the Whitney-Laidley) than Remington’s, despite the very similar appearances of the two guns.
The Montreal Rolling Blocks were carbines, fitted with long bayonets and chambered for a .43 caliber black powder cartridge. They were engraved “Montreal Police” on the barrels, and were actually never fired in anger, nor even deployed. They remained in government possession until the 1960s, when they were finally sold off. This example is here for me to film courtesy of Mike Carrick or Arms Heritage Magazine.