In the pilot episode Starsky carries a Colt 1911 in .45 ACP, but once the series started Starsky now carries a Smith and Wesson Model 59 in 9mm Luger.
There is proof of Starsky mentioning a Beretta 92 in 9mm Luger, and a Colt Diamondback in .38 Special.
In the pilot episode, and through the series entire run Hutch carries a Colt Python in .357 Magnum.
In one episode Hutch carried a Walther PPK in .32 ACP, and in one part of an episode Hutch carried a Remington 1100 in 10 gauge.
The murder gun used in the one episode, which killed Martin "Marty" Crandell and Phillip "Phil" Corman, that belong to Edward "Ed" Crown was a Smith and Wesson Model 10 in .38 Special.
The criminals carry a variety of guns, ranging from rifles, shotguns, pistols, and revolvers, in a variety of makes and models ranging from Beretta to Walther, and in a variety of calibers ranging from 22 LR to .357 Magnum.
https://en.wikipedia.org/wiki/Starsky_and_Hutch