This has been posted before, but what the heck. This is my 586-4 that I use for SSR Division in IDPA. It is a Brazil contract 586 and therefore is chambered in .38 Special. Features unique to the Brazil Contract (second issue - 1997) are the barrel is nominally 4.2". The trigger and cylinder release are MIM. The second issue guns were manufactured 4 years after the first issue (1993), yet the first issue guns were 586-5's.
As modified: Wolff RP mainspring and 14# rebound spring. Smoothed action parts. Chamfered charge holes. Weigand Combat front sight base for DX blades. Hi-Viz green FO front sight. LPA rear target sight. Hogue/S&W yellow tamer grips (from X-frame survival kit).
Happy holidays!
Adios,
Pizza Bob