New York City Police Department

===Discontinued from service===
From 1926 until 1986 the standard weapons of the department were the [[Smith & Wesson Model 10]] and the [[Colt Official Police]] [[.38 Special]] revolvers with four-inch barrels. Female officers had the option to choose to carry a three-inch barrel revolver instead of the normal four-inch model due to its lighter weight. Prior to 1994, the standard weapon of the NYPD was the [[Smith & Wesson Model 64]] DAO a .38 Special revolver with a three- or four-inch barrel and the [[Ruger Security-Six|Ruger Police Service Six]] with a four-inch barrel. This type of revolver was called the Model NY-1 by the department. After the switch in 1994 to semi-automatic pistols, officers who privately purchased [[revolver]]s before January 1, 1994, were allowed to use them for duty use until August 31, 2018. They were [[Grandfather clause|grandfathered]] in as approved off-duty guns.<ref name="thefirearmblog.com"/>

Prior to the issuing of the 9mm semi-automatic pistol NYPD detectives and plainclothes officers often carried the [[Colt Detective Special]] and/or the [[Smith & Wesson Model 36]] "Chief's Special" .38 Special caliber snub-nosed (two-inch) barrel revolvers for their ease of concealment while dressed in civilian clothes.

The [[Kahr K series|Kahr K9]] 9mm pistol was an approved off-duty/backup weapon from 1998 to 2011. It was pulled from service because it could not be modified to a 12-pound trigger pull.