I hope I'm not out of line jumping in here, but Stephen A Camp's question caught my eye.
If I'm correct, the pistol that James Caan used most in 'Thief' was longslide 1911, but there was one scene, though, in which he's packing a satin nickle or hard chrome (but probably not stainless, judging from the year the film came out) 1911, looks like a Combat Commander. There was also a snubby revolver used by one of the henchmen that looks like a custom cut-down S&W N frame.
According to the credits, guns were supplied by Hoag Gun Works. I don't know if that applies only to the longslide, or all the guns.
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Roger Shambaugh
Ottawa, Kansas
"No man who's in the wrong can stand against
a man who knows he's right and keeps on
a-comin'." Capt. Bill McDonald, Texas Rangers