Recommend you ask a gunsmith for help.
Inside the crane area
The original question was about a S&W MODEL 3914 with a serial number of TEC0486, which would have been manufactured c.1990 at the beginning of that model's production. sales@countrygunsmith.net
You must call S&W with the serial number and ask.
K
1973
You can download or request a manual via mail from the S&W web site
You will have to call S&W and give them the serial number.
Made by S&W.
100-400 USD or so
1970
No such caliber in the S&W line.