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). He manages to fire off one shot before being gunned down. In "Smoke and Mirrors" (S02E10), members of a hit squad 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).
FEG PA-63
A member of Denton Franks' gang can be seen holding what looks like a FEG PA-63 on Tom Quinn (Matthew Macfadyen) before he's disarmed in "Briefcase" (S02E07).
Heckler & Koch USP
A French assassin 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, which is the stainless version of the Smith & Wesson 3904, is seen on a table in the home of Michael Karharias.
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).
Sub Machine 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). "Special Forces" operators are also seen with them while Ruth is listing possible threats for the week in "I Spy Apocalypse" (S02E05).
Shotguns
12 Gauge Double Barreled Shotgun
While Ruth is listing possible threats for the week in "I Spy Apocalypse" (S02E05), one of the armed animal rights activists 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).
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 "Military Strikes" (S02E08).
AKS-74
While Ruth is listing possible threats for the week in "I Spy Apocalypse" (S02E05), one of the armed animal rights activist 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 "President's Visit" (S02E06)