QUOTE (chrissstopher @ Dec 27 2006, 02:31 PM)

it means they have one or 2 prop guns and use them interchangeably
Except they don't. They've had several different police revolvers, the convenience store robber's revolver, and Jessica's had two different handguns (a mother-of-pearl handled PPK and an HK P2000SK) and a rifle ... all different models.
The only guns that are the same, in fact, are Mr. Bennet's, Eden's, the phony exterminator's, and the one found at Isaac's apartment. Two held by people definitely employed by Bennet's company, one held by someone most likely employed by them as well, and one found with Isaac's body, but apparently not used to kill him.
Seems more like a clue than a careless prop choice, especially when you consider that the custom 1911 is a lot more distinctive than any of the other guns where they bothered to use different models.