Ruger PRE-I973 Instruction Manual

A FreeSafety Offer From Ruger
Do you own an “old model” (pre-1973) Ruger Single Six, Blackhawk, Super
Blackhawk, or Bearcat single action revolver like these? 
The patented Ruger Conversion Kit is an
entirely new operating system for these
revolvers.It can help prevent accidental 
discharges caused by a drop or blow to the
hammer if the user has failed to take the basic
safety precaution of keeping the hammer
down on an empty chamber. That’s very
important!
This mechanism can be factory-installed...