Was looking at all the speciality airsoft gear you can get for RE and im quite impressed.
The old faithful Remington M870, not got the wood trim, but easily fixed. Made by Maruzen.
A very rare one here, the Samurai Edge Barry Burton Special Berretta, dont remember him using one like it though, not played all the RE's however.
The standard issue S.T.A.R.S Samurai edge Beretta 92FS, this is the Leon one, but there is a Chris one also (Red instead of blue insignia) comes with a money clip.
Umbrella Magnum, another rare one.
Needs no introduction, the Ashford Lugers, they also come with a wall mount to place them in, very pretty.
Leons Desert Eagle.
Extended version, can come also with chrome slide option instead of black.
The grenade launcher from RE1 and sort of Zero (maybe others).
The echo one M78 from RE2.
Well thats all the main ones i can think of, there are others but here are the main of what you see and associate with the series.
Feel free to post anything more you find, including maybe clothing and outfits that could be used for wear.