This is a S&W 610 that I used for Bowling Pin shoots. It has a chamfered cylinder and the MIM hammer and trigger have been replaced with solid chromium parts. The hammer is "duck-billed" shaped and the trigger has a trigger stop. Double and single action trigger job. All work done by master gunsmith "Vito" at the S&W Performance Center. Front sight is a SDM Fabricating red fiber optic. rear is white outline S&W. http://www.gunbroker.com/pixhost/2001-11-25/PS2_1006986537_gun1.jpg http://www.gunbroker.com/pixhost/2001-11-25/PS2_1006986538_gun2.jpg http://www.gunbroker.com/pixhost/2001-11-25/PS2_1006986539_gun3.jpg http://www.gunbroker.com/pixhost/2001-11-25/PS2_1006986540_gun6.jpg