66177 Smith & Wesson K Model 66 Thumb Piece & Nut .357 Magnum Used Hammer Sear and 15-9 only and requires

and 15-9 only and requires a 4" or longer barrel

Direct replacement for worn factory springs

New Old stock & New parts

or a collector maintaining an authentic configuration

66177 Smith & Wesson K Model 66 Thumb Piece & Nut .357 Magnum Used Hammer Sear and 15-9 only and requiresPart# 66177 Smith & Wesson Revolver K Model 66 Thumb Piece & Nut . 357 Magnum Stainless Steel Old Style Used Part We sell Smith and Wesson Pistol and Revolver Used, New Old stock, Refurbished & New parts. Shoot us an email at sales@usagunsandgear. com or give us a call at 770 544 8075 for all your S&W gun part needs. USA Guns And Gear Gunsmiths Required: Disassembly and Assembly required to replace part. Some parts may require installation and fitting