Miroslav Gradic (Karel Roden) can be seen dual wielding what appears to be CZ 75Bs fitted with suppressors. He uses them to take out British soldiers in "Legitimate Targets" (S02E01).
SIG-Sauer P226
A terrorist is seen holding a SIG-Sauer P226 in "Nest of Angels" (S02E02). The weapon is later taken and used by Ibhn Khaldun (Alexander Siddig) to take out one of them.
Beretta 92FS
Another terrorist can be seen wielding a Beretta 92FS in "Nest of Angels" (S02E02), who manages to fire off one shot before being gunned down. Armed men who are with Tom in a raid in "Hackers" (S02E03) use them, although the Glock would be a likely choiec. In "Smoke and Mirrors" (S02E10), members of a hit squad led by rogue CIA Agent Herb Zeigler/Herman Joyce (Tomas Arana) are seen using suppressed Beretta 92FS to "recruit" Michael Karharias (Bruce Payne). CIA agents are also seen aiming them on Tom, Danny and Zoe in the same episode.
Beretta 92FS Inox
In "Hackers" (S02E03), Danny Hunter (David Oyelowo) is seen using a Beretta 92FS Inox while searching an I.T center. Tom Quinn (Matthew Macfadyen) is also seen using one during the EERIE (Extreme Emergency Response Initiative Exercise) during "I Spy Apocalypse" (S02E05).
In "Hackers" (S02E03), Zoe Reynolds (Keeley Hawes) is seen showing off a holstered Glock 17.
Stechkin APS
Members of the Russian Mafia can be seen wielding and threatening a hostage with a Stechkin APS in "Blood and Money" (S02E04).
Makarov PM
Maxim Baxter (Julie Cox) can be seen checking a Makarov PM in "Blood and Money" (S02E04).
CZ 83
A member of Denton Franks' gang can be seen holding what looks like a CZ 83 on Tom Quinn (Matthew Macfadyen) before he's disarmed in "Briefcase" (S02E07).
Heckler & Koch USP
A DGSE agent named Bertrand (Philippe De Grossouvre) is seen pulling a Heckler & Koch USP while disguised as a security guard in "Briefcase" (S02E07).
Inglis Hi-Power
Major Samuel Curtis (Reece Dinsdale) can be seen pulling an Inglis Hi-Power (here substituting for the Browning Hi-Power, which was the British military sidearm of the time) on Tom and Danny in "Military Strikes" (S02E08). It can be distinguished from the Browning by the distinctive 'humped' fixed rear sights.
Smith & Wesson 3906
What appears to be a Smith & Wesson 3906 is seen on a table in the home of Michael Karharias in "Smoke and Mirrors" (S02E10).
Revolvers
Smith & Wesson Model 13
Denton Franks, one of the thieves who robs Harry's house, is seen pulling a Smith & Wesson Model 13 in "Briefcase" (S02E07).
Submachine Guns
Heckler & Koch MP5A3
In "Nest of Angels" (S02E02), authorized firearms officers are seen armed with Heckler & Koch MP5A3s, being used against Muhammed Ibhn Khaldun (Alexander Siddig). SAS/SO19 operators are seen with them, with or with no weaponlights attached.
Heckler & Koch MP5SD3
A Heckler & Koch MP5SD3 is used in "Strike Force" (S2E08) by a SAS commando during an anti-terrorist op.
Shotguns
12 Gauge Double Barreled Shotgun
While Ruth is listing possible threats for the week in "I Spy Apocalypse" (S02E05), one of the armed survivalists from Patmos uses a 12 Gauge Double Barreled Shotgun. Tom Quinn (Matthew Macfadyen) is also seen using one to shoot and wound Harry Pearce in "Smoke and Mirrors" (S02E10).
Assault Rifles
Norinco Type 56-1
Gradic's men are seen armed with Norinco Type 56-1s in in "Legitimate Targets" (S02E01). They're initially seen with suppressors when they ambush a British Army transport convoy.
Enfield L85A1
British Army soldiers are seen standing guard with Enfield L85A1s in "Legitimate Targets" (S02E01). British soldiers, including an undercover Tom Quinn (Matthew Macfadyen), are also seen using them fitted with blank-firing adaptors attached to their barrels in "Strike Force" (S02E08). Rather than the correct British model of SUSAT, the rifles are actually fitted with the Swedish variant designed for the Bofors AK 5B as identified by the different mounting base.
AKS-74
While Ruth is listing possible threats for the week in "I Spy Apocalypse" (S02E05), one of the Patmos activists train with what appears to be an AKS-74.
Heckler & Koch G36K
SAS operators can be seen moving into position while armed with Heckler & Koch G36Ks in "Military Strikes" (S02E08). CIA agents who take Tom are also seen armed with them in "Smoke and Mirrors" (S02E10)
Sniper Rifles
Heckler & Koch SR9
A SO19 sniper is seen armed with what appears to be a Heckler & Koch SR9 in "Without Incident" (S02E06) during a deployment in Chequers.
A Gepard M1 is seen placed at the feet of Tom Quinn by Zeigler aka Herman Joyce in "Smoke and Mirrors" (S02E10). The rifle used is now part of the Film and TV display at the Royal Armouries Museum in Leeds.
Machine Guns
ADEN cannon
The ADEN cannon is seen with Royal Air Force Harriers deployed in "Without Incident" (S02E06).
Grenade Launchers
GP-30
The GP-30 is seen attached on an AK-74 in "I Spy Apocalypse" (S02E05).