Witness

Starring Harrison Ford, we can see:

Smith & Wesson Model 10

A 2" barreled Smith & Wesson Model 10 , as the sidearm of Harrison Ford :

"Witness"

"Witness"

"Witness"

Smith & Wesson Model 27 / 28

Danny Glover carries a Smith & Wesson Model 27 / 28 with a 4" barrel.

"Witness"

Smith & Wesson Model 27 Snub nosed revolver with 3.5" barrel - .357 magnum.

Remington 870 Shotgun

At the end of the movie, when the corrupt police officers are coming after Harrison Ford, Danny Glover carries what appears to be a Remington 870 with a pistol grip, folding stock and extended magazine.

Remington 870 Police Magnum with stock folded - 12 gauge

Remington 870 Police Folder with extended magazine tube - stock extended - 12 gauge