(Please visit the 24 page for other seasons of the series)
In Day 2 of 24, former agent Jack Bauer (Kiefer Sutherland) is recruited by CTU to go undercover to order to prevent a terrorist group from detonating a bomb somewhere in the city of Los Angeles.
The following weapons were used in Season 2 of 24:
The Glock 19 is carried by several members of CTU, including Director George Mason (Xander Berkeley) when he discovers the weapons-grade plutonium in Panorama City in Episode 3 and Agent Tom Baker (Daniel Dae Kim). FBI Special Agent Rick Phillips (Michael Cudlitz) carries a Glock as his sidearm and notably uses it to threaten Nina Myers in Episode 9 "4:00pm - 5:00pm".
Beretta 92FS
A Beretta 92FS is used by Jack to eliminate a witness in Episode 1. Also used by LAPD officers, notably to kill a terrorist firing on Mason. Also Jack Bauer uses it in the final episodes.
Beretta 92FS Inox
Jack Bauer (Kiefer Sutherland) takes a Beretta 92FS Inox off of Eddie Grant (Douglas O'Keeffe) in Episode 4 - "11:00am - 12:00pm" when he breaks from his undercover identity to get the address of Grant's boss, Joseph Wald (Jon Gries). When Grant's buddies see the action, though, a gunfight ensues, and Bauer uses both the Beretta and his own revolver to eliminate them. Grant takes several rounds in the face from the Beretta. It's also used by Yusuf Auda during the shootout at the warehouse, and later by one of the racists who beat Yusuf Auda to death. It's also the sidearm of Tony Almeida.
Beretta 9000S
Jack is seen giving Kate Warner (Sarah Wynter) a Beretta 9000S during a shootout in Episode 18 "1:00am-2:00am".
Flashpaper Beretta 92FS
When Syed Ali (Francesco Quinn) pulls a handgun on Paul Koplin, the "Beretta" he uses is actually a Non Gun.
Colt M1911A1
Captain Jonathan Wallace (Gregg Henry) uses an M1911A1 during the warehouse shootout.
Heckler & Koch USP
In a continuity error, Sgt. Arroyo (Sal Landi) is seen a Heckler & Koch USP to kill terrorists firing on George Mason (the officer had earlier held a S&W 4904). Chris, one of the men on Eddie Grant's crew that bombed CTU also had a USP. When Jack Bauer (Kiefer Sutherland) is revived after being tortured to a near-death state, his initial torturer is killed and Raymond O'Hara (Brian Goodman) takes over. But as he attempts to get information from Jack, a doctor forced to help him attacks him instead, allowing Bauer to grab Raymond's gun - a suppressed Heckler & Koch USP. Bauer dispatches Raymond and his guards, and later uses it to subdue several racists who kidnapped Kate Warner (Sarah Wynter) and got ahold of an important computer chip.
IMI Jericho 941 (Stainless)
In Episode 7 "2:00pm-3:00pm", Nina Myers (Sarah Clarke) is seen trying use a stainless Jericho 941 to blow a lock open before Jack catches up to her.
Smith & Wesson 5904
Sgt. Arroyo (Sal Landi) is seen carrying the Smith & Wesson 5904 while investigating a warehouse in Panorama City in Episode 3 - "10:00am-11:00am". Later, Arroyo's handgun becomes a USP in a continuity error.
Peter Kingsley (Tobin Bell) uses a Smith & Wesson SW99 during the shootout at the Los Angeles Coliseum in the season finale, Episode 24.
Walther PPK
In the Season 2 finale, one of Peter Kingsley's henchmen has a Walther PPK in an ankle holster. During a fight with Jack Bauer (Kiefer Sutherland), he tries to use it with no success, discharging the weapon several times. A few minutes later, Jack tries to use it against Kingsley himself, but to no avail - the gun is empty.
Revolvers
Smith & Wesson Model 60
Jack Bauer (Kiefer Sutherland) carries a snubnosed Smith & Wesson Model 60 while undercover, later seen dual-wielding it with a Beretta 92FS Inox. What appears to be a Smith & Wesson Model 60 is given to Kim by Lonnie (Kevin Dillon) for protection against cougars. She later uses it to scare away a dangerous stranger. The revolver is then seen held during a standoff in a convenience store.
Submachine Guns
IMI Uzi
An IMI Uzi is used by a terrorist to fire on Mason and the LAPD team infiltrating the warehouse in Panorama City.
IMI Micro Uzi
Used by Captain Jonathan Wallace while escaping the warehouse. This SMG is also used by terrorists throughout this season.
MAC-10
Used by Jack Bauer and Captain Jonathan Wallace when escaping the warehouse.
Beretta M12
Kingsley's men use the Beretta M12 during the warehouse shootout and the season finale.
Heckler & Koch MP5KA4
Secret Service agents are seen pulling out their Heckler & Koch MP5KA4's when President Palmer collapses in Episode 24.
Heckler & Koch MP5A2
Heckler & Koch MP5A2 submachine guns were used by members of the CTU tactical team, notably in Episode 9 - 4:00pm - 5:00pm" and Episode 10 - "5:00pm - 6:00pm".
Heckler & Koch MP5A3
The Heckler & Koch MP5A3 is seen in the hands of the FBI SWAT team in Episode 7 "2:00pm-3:00pm". A MP5A3 is fitted with an Aimpoint sight and a tri-rail RAS forearm is used by Yusuf Auda during the firefight with the Coral Snake commandos at the warehouse. Interestingly when he removes it from the trunk it has a 20 round magazine and in the next cut immediately following it changes to a 30 round magazine.
Shotguns
Remington 870
An LAPD officer is seen with a Remington 870 notably when entering the warehouse in Episode 3 - "10:00am-11:00am".
Jack is seen using a Mossberg 500 Cruiser during the raid on 18 Starling Court in Episode 10 - "5:00pm - 6:00pm".
Rifles
AK Rifles
AK rifles are seen in the hands of Second Wave militants in some video footage in Episode 1. Syed Ali is shown a video feed of security forces holding AK rifles on his family members.
M4A1
M4A1 carbines are carried by the Coral Snake Commandos and used by Jack Bauer and Nina Myers in Episode 9 - "4:00pm - 5:00pm" and Episode 10 - "5:00pm - 6:00pm". Many of the rifles are fitted with an ACOG sight, foregrip, AN/PEQ2A Laser Aiming Module and 20-round magazine (atypical for an M4). Coral Snake Commandos used them again during the warehouse shootout judging by the muzzle flashes.
M16A2
US Marines guarding the Northwest Regional Operations Complex are armed with M16A2 rifles.
Heckler & Koch G36K
Seen in the weapons drawer in the trunk of Jack Bauer's CTU vehicle, amongst other weapons, with stock folded.
Sniper Rifles
Remington 700 AICS
In Episode 10 - "5:00pm - 6:00pm", a CTU tac team sniper takes aim at Nina with a Remington 700 housed in the AICS.
Remington 700PSS
CTU TAC snipers are seen taking up positions in various episodes with the Remington 700PSS rifle, notably in Episode 11 - "6:00pm - 7:00pm."
Remington 700BDL
In Episode 12 "7:00pm-8:00pm", Lonnie McRae (Kevin Dillon) is seen holding a Remington 700 BDL rifle when he encounters Kim Bauer.
Heckler & Koch SR9(T)
In Episode 24, Jack is seen at the stadium taking aim at Kingsley's men with a Heckler & Koch SR9(T).
Other
Heckler & Koch P2A1 Flare Pistol
After his plane crashes, Jack Bauer is taking a Heckler & Koch P2A1 Flare Pistol from the wreckage and using it on a Coral Snake Commando in Episode 9 - "4:00pm - 5:00pm".