Stargate SG-1

Pistols

Beretta M9

The standard sidearm for U.S. military personnel.

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Sub-machineguns

FN P90 Personal Defense Weapon

This became the most common weapon after its introduction in Season 4, Episode 8 ("The First Ones"). The episode that introduced it, O'neil suggested the weapon because of the ammo was more penetrating than the MP-5 despite taking rifles would also work. We can assume it was just a device in the script just to bring this weapon the weapon that is identified when anyone thinks of of the Stargate series. The series probably picked this weapon from its futuristic look, something unique from the other weapons at the time.

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H&K MP5A3

The main weapon used by all SG teams for the first few seasons.

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Heckler & Koch MP5A3 - 9x19mm

H&K MP7

Seen in a few episodes in place of the famous P90 the team uses. Teal'c has been used duel wielding these in an episode or 2. File:MP7.jpg

Shotguns

Aserma Protecta Shotgun

This was portrayed as a grenade launcher. File:AsermaProtectaShotgun.jpg

Franchi SPAS 12

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Franchi SPAS-12 shotgun - 12 gauge

USAS-12 Assault Shotgun

Seen mostly in the episodes where we see Replicators

Carbines and Rifles

GAU-5/A

The GAU-5/A was the USAF contract version of the XM177 "CAR-15" short assault rifle. The USAF Security forces used them until recently, however, most of the non firing GAU-5/As seen in the show were simply XM177E2 "Airsoft guns". The actual GAU-5/A carbines look like the XM177E2 but don't have forward Assist buttons.

H&K G3 SG-1

Used in a few episode, once with O'neil. This is the real name of the rifle, and a coincidence to the name of the team that used it on occasion.

M4A1

"Carter Special" Micro Carbine

This is a customized Armalite M15A4 Carbine with a short 11.5" barrel, aftermarket quadruple-rail SOPMOD accessory forend, and a modified thumb-hole stock taken from a Sterling AR-180 rifle. It is used with an ELCAN sight and a Beta C-Mag dual-lobed 100-round drum and can mount a vertical foregrip and a side-mounted flashlight on the accessory rail. It first appears in Season 7, Episode 9 ("Avenger 2.0"). It gets its name from Major Samantha Carter, the only character who carries it.

H&K G36K

Several times in the last couple season, this rifle was seen in used by the Marines or Mitchel

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Heavy Weapons

M72 LAW

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M72A2 LAW (Light Anti-armor Weapon) - 72mm

Cobray 37mm Launcher

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CM79LF 37mm Launcher

O'Neill uses a CM79LF as a 40mm grenade launcher.

AT-4

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M136 AT4 Rocket Launcher - 84mm

Most commonly 'mis used' as a surface to air missile to shoot down Goa'uld Death Gliders, however, the AT-4 is an 84mm Anti Tank Weapon.