Customer brought this into the shop for cleaning and inspection/ test fire. Said it was passed down from some family member. I pretty sure its a Remington model 10. Has "San Quentin" stamped into the left side of the receiver, and Ordinance numbers on the trigger housing and bottom of receiver. The barrel doesn't have any type of front sight, and looks like its been cut down. I cant seem to find any information on if they used Model 10's at San Quentin, or how the guard guns were marked. Do yall think its it's legit or bubbas backyard chop job and someone got bored with a set of letter stamps?