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).
In the episode 200 (Season 10, Episode 6), Mitchell imagined himself fighting zombies. If you forgot about this episode, yes zombies. When he was doing his last stand backing towards the activating gate, he took out a two tone Jericho 941 or the "Baby Eagle", as director Martin Wood refers to Mitchell's handgun correctly in the DVD commentary.
The Vektor CP1 can be seen during the episode "Company of Thieves" (Season 10, Episode 9) in the hands of Anateo (Rudolf Martin), Netan (Eric Steinberg) and another Lucian Alliance soldier.
A number of Beretta PM12S submachine guns are seen used in the same episode "Bad Guys" (Season 10, Episode 16) as the Scorpion by security guards and the police of that planet. One was also taken by Teal'c so he can dual wield it.
In the episode "200" (Season 10, Episode 6), Mitchell, in his own imagination, was seeing dual wielding MP7s with the gun's sights folded and with extended magazines fending off Zombies.
The Kimel AP-9 can be seen in the episodes "Company of Thieves" (Season 10, Episode 9) and "Bounty" (Season 10, Episode 15) as one of the primary weapons of the Lucian Alliance foot soldiers.
In "Uninvited" (Season 10, Episode 5), the general and Mitchell were seen carrying New Haven Model 600AT pump action shotguns. General Landry (Beau Bridges) is carrying a New Haven Model 600AT 12ga Shotgun with a 28" ribbed barrel.
The shotgun that Mitchell (Ben Browder) is carrying in "Uninvited" (Season 10, Episode 5) is the Winchester Model 120 Ranger with a 28" barrel. It is chambered in 12ga. The Model 120 Ranger was a field version that was developed as a final 'variant' of the blued metal Model 1200. It was made between 1986-1989, well after the cessation of most of the Model 1200 production, but Winchester eventually ceased all production in favor of promoting their (cheaper to make) aluminum/alloy Model 1300.
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.
M4A1
One of the primary weapons utilized by the Stargate teams. During later seasons they are rarely seen without any attachments, mostly being equipped with flashlights, Cobray flare launchers and laser aiming modules. A small side note for the interested reader: The lower handguard on the M4 has to be removed in order to accommodate underbarrel grenade launchers like the M203 or, in this case, the Cobray 37mm Launcher.
These two guns were set up in the gate room but were never used in the 10 years the show ran for. The M2 was also used at the Alpha site in "Allegiance" (Season 6, Episode 9), but was - once again - not fired. The weapon was then seen in "Bad Guys" (Season 10, Episode 16), mounted on an APC used by the alien security forces. The only instance were the weapon saw actual combat was in "Forever in a Day" (Season 3, Episode 10), were it was mounted on a F.R.E.D. during the onslaught of Heru'ur´s Jaffa.
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.)
M60 Series GPMG
Seen used by Marines in a support role in several episodes. Some marines are carrying the M60E3 version.
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.
Used most prominently in "Insiders" (Season 10, Episode 4) to take out the guards of one of Ba´al´s clones. The specific make is - as of yet - unknown.
