Handguns

Beretta 92FS

While in reality the Beretta M9 is the standard issue sidearm for US military, the Beretta 92FS is the weapon seen used in the series by the US military personnel. The handgun is used by Commander Harmon "Harm" Rabb, Jr. (David James Elliott), Lieutenant Colonel Sarah "Mac" Mackenzie (Catherine Bell) and Rear Admiral A.J. Chegwidden (John M. Jackson).

92FS; Chambered in 9x19mm. Used in JAG as the standard issue firearm of the US Military.

Beretta 950 Jetfire

An engraved nickel Beretta 950 Jetfire is seen given to RADM Chegwidden by his ex-wife Marcella (Barbara Carrera) in "Going After Francesca" (S4E04). It is later used by the admiral's daughter Francesca (Guiliana Santini) in the same episode.

Beretta Jetfire .25 ACP‎

In "Going After Francesca" (S4E04), Marcella (Barbara Carrera) takes out the Beretta 950.

Francesca (Guiliana Santini) fires the Beretta in "Going After Francesca" (S4E04).

Colt M1911A1

A Colt M1911A1 is used by young Lieutenant Tom Boone in a Vietnam flashback in "A Separate Peace".

Parkerized Colt M1911A1 Pistol

Chegwidden loads his old M1911A1 in Season 2's "Ghosts".

Glock 17

Harm is seen firing a Glock 17 in "Embassy" (S4E02).

A Generation 2 Glock 17 in 9x19mm. This model added finger stepping and cuts to the backstrap of the frame to make it easier to hold than the Generation 1 model.

In "Embassy" (S4E02), Harm aims a Glock at the ambassador threatening Mac.

Smith & Wesson 4006

A Smith & Wesson 4006 is used by the Italian mobster Luscino in "Going After Francesca".

Smith & Wesson 4006 .40 S&W

Luscino threatens Francesca with a Smith & Wesson 4006

Walther PPK

The Walther PPK is used throughout the series, notably by Clayton Webb (Steven Culp).

Walther PPK - 9mm Kurz aka 9x17mm (.380 ACP)

CIA Officer Clayton Webb (Steven Culp) uses the Walther PPK in "Soul Searching" (S4E22).

Walther PPK/S

In "Embassy" (S4E02), Ambassador Moshak (Vincent Riotta) pulls a Walther PPK/S and holds Mac hostage with it.

Walther PPK stainless - 9mm Kurz aka 9x17mm (.380 ACP)

In "Embassy" (S4E02), Ambassador Moshak (Vincent Riotta) pulls a Walther PPK/S.

Shotguns

Mossberg 590

Chegwidden and Harm are seen using Mossberg 590 shotguns in "Going After Francesca" (S4E04). While it's mentioned that the shotguns have speedfeed stocks, these shotguns appear to not have them.