Mickey Blue Eyes
The following firearms can be seen in the film Mickey Blue Eyes:
Johnny Graziosi (John Ventimiglia) uses a suppressed Walther PPK/S when he barges in on Michael (Hugh Grant) and Gina (Jeanne Tripplehorn). Gina subsequently fires the PPK towards the ceiling when the bullet ricochets into Johnny. Vinnie D'Agostino (Joe Viterelli) uses a PPK to "shoot" Gina at the wedding. In the last two pictures of the PPK pictures, the gun doesn't look much like a PPK to me.
Smith & Wesson 6906
Frank Vitale (James Caan) uses a Beretta 92FS when he "shoots" Michael Felgate (Hugh Grant) in preparation for the FBI sting. At the wedding, Frank is forced to hand his blank-loaded Beretta over to Vito Graziosi (Burt Young) in exchange for Vito's son Johnny's revolver. Most of the FBI agents at the wedding carry Beretta 92FSs as well.
Ruger Security Six
Vito Graziosi (Burt Young) gives Frank Vitale (James Caan) a Ruger Security Six revolver with stainless steel finish, short barrel, and rubber grips to shoot Michael. Note the adjustable sights. Only the Security Six had adjustable sights.
One of the FBI agents carries a SIG-Sauer P225, which he uses to "shoot" Vinnie.
An FBI agent carries a Galil during the wedding bust.