Splinter Cell: Double Agent

Modified FN F2000 Tactical

Used by Sam Fisher throughout the game. It has an integral suppressor, red dot reflex sight, and an FN EGLM launcher attached.

FN F2000 Tactical with folding foregrip 5.56x45mm NATO

FN FiveseveN

Used by Sam Fisher throughout the game. Equipped with a suppressor and EMP device attached. It appears to be the original model.

FN Five-SeveN (Original Model), 5.7x28mm. This model is no longer produced.

FN 303 Non Lethal Launcher

FN 303 - 18mm Non Lethal launcher (pepper ball gun)

While the game calls it a non lethal shotgun, the model used in the game is the FN 303 non lethal launcher.

Luger P08

Carried by Emile Dufraine and given to Sam on occasion to be used for executions.

It would seem Emile only carries one round as it never fires more than one round and it is only loaded with one both times it is to be used by fisher, or perhaps he simply doesn't trust Fisher with a fully loaded gun.

Luger P08 9x19mm

Beretta 92FS

Used as the sidearm of most enemies in the game.

Beretta 92FS - 9x19mm.

Also an Inox version can be used by Sam in the prison if he kills the guy in the exercise yard. It has the same power as the FN 57 but it isn't suppressed. Also used in the PsP version of the game, Essentials. But the game is slightly different than the console version.

Beretta 92FS INOX - 9x19mm.

Desert Eagle

Used as a sidearm by a few enemies, most notably Moss. Appears in place of the Luger in pre release screenshots. I am unsure which variant it is.

Desert Eagle MK VII - .357 Magnum.

AKM

Used by various enemies, including rebels in Kinshasa, and JBA members. Easily the most common long-arm in the game.

AKM, Stamped Steel Receiver w/ slant muzzle brake 7.62x39mm

XM8

The SWAT team at the end of the game use XM8 assault rifles with flashlights and laser sights attached.

Fitted with an Insight ISM-V sight.

Ruger AC556

Used by government forces in Kinshasa. Appears to have synthetic furniture.

Ruger AC556 Carbine - 5.56x45mm. This is the full automatic version of the Mini 14 with a distinctive Barrel and bayonet lug.

FN FAL

Used by Mexican coastguards aboard the Cosumel. I am unsure of the variant.

FN FAL 50.00 7.62x51mm NATO

M249 SAW

Used by Emile Dufraisne in the Playstation 2 version.

M249-E2 SAW - upgraded M249 with heat shield and full synthetic Stock - 5.56x45mm with 200 round ammo drum.

Barrett M82

Is used in the shooting range at the JBA's headquarters, where it sounds as if it is suppressed despite not having a suppressor attached. Is used again later in Kinshasa at a pivotal moment in the game, where it is fitted with a laser microphone and no longer sounds suppressed.

Barrett M82A1 sniper rifle .50 BMG