Remington #1 & #5
Rolling Block

The illustration shown below was taken from Frank de Haas's Single Shot Rifle book with the part numbers changed to reflect factory part numbers.  This is important as about all obsolete parts suppliers use ONLY factory or closely associated numbers where ever possible so everyone is on the same page.

Note, for some of the older firearms, many over 100 years old, the factories never used what we now know as assembly drawings, but just views of many of the component parts & possibly randomly placed 

The Above illustration taken from Frank de Haas Single Shot Rifles & Actions book with the numbers changed to match factory #5 part numbers

The #1 rifle was made as a military version, while the sporting version was known as the #5. 
The 1902 7mm is closest to the commercial #5 shown above. 
There will be differences between the many military  #1 variations, but most notable are the firing pins & extractors