“After this class, the days of seeing a police officer out there carrying a swivel holster or a .38 holster with a .38 in there are basically nonexistent,” Inspector Richard G. DiBlasio, the commanding officer of the Firearms and Tactics Section, said. “It’s tradition and some people don’t want to let go of it, but tactics is always number one.”

Revolvers became the standard firearm for city police officers in 1895, and they remained the dominant weapon in policing for much of the 20th Century. More than 2,000 city police officers still held on to the revolvers over a decade after Sig Sauer and Glock pistols became standard. Their numbers dwindled with each wave of retirements, to 160 by the time the Police Department announced in November that it was phasing out revolvers completely and permanently.

But the change has been met with resistance from officers reluctant to set aside the revolvers that they regard as old friends for unfamiliar pistols that have twice the capacity but are susceptible to jamming. Officer Mary Lawrence, a crime prevention officer in the 103rd precinct in Queens, said that was never a concern with the Smith & Wesson revolver that she has used over her 26 years with the department.

“I’m proud of this uniform that I’m wearing and I’m proud of my gun that I carry because it’s been reliable to me,” she said. “I didn’t think that I needed extra firepower at all.”