The following weapons were used in the film The Yards:
Colt Detective Special
When Willie confronts him at "the yards", the yardmaster reaches for an early Colt Detective Special in his duffel bag.
Willie Gutierrez (Joaquin Phoenix) keeps a Walther PPK in his kitchen as a personal weapon, seen only briefly when he chambers it after hearing a knock at the door. Leo Handler (Mark Wahlberg) is given a Walther PPK which he carries throughout the film. Willie's thug Raymond Price (Andy Davoli) also carries a PPK, which Leo grabs after subduing him. The weapon carried by Leo on the DVD cover is a Dan Wesson revolver, never seen in the actual film.
The NYPD, both the officers and the ESU, carries Glock 17 pistols throughout the film.
NYPD ESU officers carry Ithaca 37 shotguns when raiding the Handlers' apartment.