The Taurus PT92 is used in the first 12 episodes of Stargate SG-1's first season as a stand-in for the actual, firing Beretta 92FS/M9, which was apparently unavailable to the production crew until the 13th episode of the first season, "Hathor" (Season 1, Episode 13).
The most common sidearm seen in used by the SG teams (although in real life, the M9 is the military designation for the Beretta, the prop weapons used in the show are most likely the civilian Beretta 92FS).
The Heckler & Koch MP5A3, almost exclusively equipped with the Surefire dedicated forend weaponlight, small scopes and dual mag clamps, is the primary weapon used by all SG teams for the first few seasons. Then when the main cast and some supporting and extras switched to the P90, the MP5 became less common. Also seen in use by the Free Jaffa Nation later in the series. MP5 also makes a small comeback when we see them again in the hands of a special assault unit raiding a Trust compound. Throughout the series it is generally the case that for non firing scenes the actors carry airsoft replica MP5s with a Navy trigger group, whereas for firing scenes their weapons switch to real firearms with SEF trigger groups.
This assault shotgun is seen mostly in the episodes featuring the Replicators, but actually had its very first appearance in the first episode "Children of the Gods" (Season 1, Episode 1). The USAS-12 shotguns in SG1 are newer CQ versions with a modified carry handle, no front sight and shortened barrel (sometimes with a muzzle brake).
The GAU-5/A and GAU-5A/A were the USAF contract versions of the XM177 and XM177E2 "CAR-15" short assault rifle. The USAF Security forces used them until recently, however, most of the non firing GAU-5A/As seen in the show were simply XM177E2 "Airsoft guns". The actual GAU-5A/A carbines look like the XM177E2 but don't have forward Assist buttons.
The GAU-5 variants that appeared on the show seem to be a mix of full-auto converted Colt AR-15 SP1s and Olympic Arms K3Bs, all with chopped barrels and fake GAU-5 flash hiders installed. The converted AR-15 SP1s have the "slab-side" receiver, while the K3Bs are recognizable by their 715-style receiver (forward assist, brass deflector, A1-style rear sight) and "Stowaway" pistol grips.
Error creating thumbnail: File missingXM177E1 Carbine (AKA Colt Model 610) - 5.56x45mm. In USAF service, this weapon was known as the GAU-5/A.Error creating thumbnail: File missingShortly before the first intrusion that causes the Stargate program to be reactivated, the guards in the gate room nervously approach the open wormhole, their Carbines at the ready.File:SG1 - S1EP1GAU.jpgOne of the Air Force men firing his XM177 with under slung Cobray CM203 at advancing Jaffa soldiers in "Children Of The Gods" (Season 1, Episode 1).Error creating thumbnail: File missingSkaara (Alexis Cruz) fires a XM177 when Apophis's Jaffa arrive in "Children Of The Gods" (Season 1, Episode 1).Error creating thumbnail: File missingGate room security personnel aim their weapons at the Tolans as they prepare to leave in "Enigma" (Season 1, Episode 17).
M1 Garand
First seen in "Fire and Water" (Season 1, Episode 12) in the hands of two members of the colour guard during the memorial service.
Usually seen carried by the Cheyenne Mountain guards in stock footage.
Error creating thumbnail: File missingM16A1 with 30 Round magazine - 5.56x45mmError creating thumbnail: File missingNever understood why the guy on the left always seem to hold onto his M16 slung behind him, as if to keep it from swinging around. Isn't that what slinging your rifle on your back is for? The point is so it doesn't swing around and bother you.Error creating thumbnail: File missingTwo guards with M16A1 rifles in stock footage guarding the entrance to Cheyenne Mountain. Note the difference in trigger discipline.
Machine Guns
Daewoo K3 (mocked up as M249)
Contrary to popular belief, there are no real FN Minimi or M249 light machine guns used in Stargate: SG1 or its sister show, Stargate: Atlantis. The light machine guns used by the SG teams are actually Korean-made Daewoo K3s that have been fitted with M249 Paratrooper-style stocks and shortened barrels. Some of the K3s seen on the show also have RIS rails and vertical grips similar to those seen on the Mk 46 Mod 0.
Error creating thumbnail: File missingA Daewoo K3 "Paratrooper" model, with a chopped barrel buttstock removed to resemble an M249 Paratrooper, and with a 200 round "soft pack" magazine. Guns in similar configurations have been seen in many action films. (This picture was edited in GIMP.)Error creating thumbnail: File missingMajor Kawalsky (Jay Acovone ) fires his Daewoo K3 at the Jaffa during the fire fight at the gate in "Children Of The Gods" (Season 1, Episode 1).
Heavy Weapons
Cobray CM203 Flare Launcher
Seen attached to M4s and M16s. Prop wise, these were all Cobray 37mm flare launchers meant to mimic the appearance of an M203. What tips them off is the absence of a second trigger, the shape of the trigger guard, the lack of a step up in the receiver, and the cocking lever on the SIDE of the receiver.
Seen twice, first in the first season opener "Children of the Gods" (Season 1, Episode 1), where it is used by a member of SG-2 to take out a glider. This is the correct weapon to use for surface to air attack unlike the AT-4 which is sometimes utilized for this purpose in Stargate SG-1.
Samantha Carter uses a M67 hand grenade in "There But for the Grace of God" (Season 1, Episode 20).
M67 fragmentation grenadeError creating thumbnail: File missingDr. Samantha Carter sacrifices herself in "There But for the Grace of God" (Season 1, Episode 20), in order to enable Dr. Jacksons escape.
