Some of Dr. Mars's gunmen in "Falling Ash" carry the 92FS. Division operatives and Guardians use the Beretta. MI6 agents operating in Russia are armed with the 92FS in "Arising". Robby uses one while disguised as a civilian contractor in infiltrating Maxwell AFB in "Crossbow".
Beretta 92FS Inox
Sean carries the Beretta 92FS Inox as his sidearm for the entire season. Nikita uses an Inox in "Falling Ash", and Alex uses another Inox in "Fair Trade" to kill a corrupt ICE agent. Percy carries the Inox as his sidearm in "Doublecross" and "Homecoming"
Beretta Px4 Storm
In Partners, former Division agent Kelly (Katheryn Winnick) is seen using a PX4 during a confrontation with Alex and Nikita.
Beretta Px4 Storm Sub-Compact
Ari Tasarov (Peter Outerbridge) is seen removing a Beretta Px4 Storm Sub-Compact from Sergei Semak's (Peter J. Lucas) desk in "Partners". A few moments later, Sergei is seen using it to execute a GOGOL official. Cassandra (Helena Mattsson) uses one the "London Calling", later passing the weapon to Nikita. Alex (Lyndsy Fonseca) carries the Px4 Storm Sub-Compact in "Origins" after taking it from a GOGOL operative and uses it in the ensuing gun battle. It then becomes her main sidearm for the rest of the season.
Beretta 93R
Michael's (Shane West) sidearm for the first part of Season 2 is a Beretta 93R with the foregrip removed. Nikita takes a Beretta 93R off a guard in "Pale Fire" and uses it during the escape.
Walther P99AS
Nikita uses the Walther P99AS as her sidearm in Season 2, carrying it throughout the season
Glock 17
Nikita uses a Glock 17 in "Game Change" (E1), "Power" (E18) and "Crossbow"(E22), usually "borrowed" from subdued foes. The fake Belarusian president in "Looking Glass" (E5) uses a Glock 17 to threaten Alex before being disarmed. Various police officers, Army MPs, and bodyguards carry the weapon as well. Division personnel mandated for combat/guard duty carry the Glock 17 as their main sidearm.
Glock 26
In "Falling Ash" (S2E2), a brainwashed ice cream vendor uses a Glock 26 to assassinate a Senator. Alex carries a Glock 26, sometimes suppressed, as her sidearm for the first half of the season and specifically requests it from a weapons dealer in Russia. Roan carries the Glock 26, often suppressed, for the entire season. During Nikita's flashback to her drug-addict past in "Rogue" (S2E14), she used a Glock 26 to execute a plainclothes policeman. Birkhoff finds a Glock 26 with an extended barrel during the police station battle in "Shadow Walker" (S2E20) and uses it to kill a Division agent.
Michael carries a Smith & Wesson SW1911 Compact ES in "Shadow Walker" (S2E20). He is also seen with it in "Dead Drop" (S2E21). This is presumably his new weapon of choice.
Ruger KP89
Alex carries a Ruger KP89 in "Doublecross" (S2E16). It may be a reference to the old 1997 La Femme Nikita show, in which the KP89 was standard-issue.
SIG-Sauer P226
A two-tone P226 is used by Percy in Knightfall to cripple Ramon in order to force him to work for Division.
SIG-Sauer P239
A silenced P239 with a stainless body is seen in "Power".
Walther P22
A brainwashed woman in Falling Ash uses a Walther P22 to assassinate a Senator.
Bond Arms Snake Slayer IV
Alex takes a Bond Arms Snake Slayer IV derringer from the Division armory in "Clawback". Amanda carries the derringer in "Power" (E18) and "Homecoming" (E23), though a screenshot was unavailable.
Zoraki 914
On several occasions, Zoraki 914 blank firing pistols are used. These pistols are capable of semi automatic and full automatic fire, and are used to substitute for conventional pistols and machine pistols.
Revolvers
Chiappa Rhino 20DS
In "Power" (S02E18) Ari Tasarov (Peter Outerbridge) can be with a chrome plated Chiappa Rhino 20DS (2" barreled version) revolver with a fibre optic front sight.
Smith & Wesson Model 66
In "Partners", Kelly uses what appears to be a Smith & Wesson Model 66 taken from a Turkish Gendarmerie officer. This is a continuity error as she had earlier been holding a snub Colt Python.
Colt Python
In a continuity error, Kelly uses a Colt Python with a 2.5" barrel when she ambushes Nikita in Partners rather than her Smith and Wesson Model 66.
Dr. Henderson carries a Smith & Wesson Model 36 when Nikita and Micheal visit him in "Crossbow' (E22)
Submachine Guns
Heckler & Koch MP7
Nikita carries the MP7 as her primary heavy weapon in Season 2, first seen in "343 Walnut Lane" (S2E6). Michael, Alex, and Sean also use the MP7, the latter two notably using it in "Crossbow" and "Homecoming".
Heckler & Koch MP5A3
Division agents, as well as various thugs and police officers, carry MP5A3s with tri-rails and foregrips.
Heckler & Koch MP5K
The MP5K is used by various bodyguards and henchmen throughout Season 2. Michael carries one in "Guardian" during the black-box gunfight in Switzerland. Percy uses the MP5K in "Rogue"; and Carla takes one in "Doublecross" after being wounded by Birkhoff.
TDI Vector
Birkhoff (Aaron Stanford) carries a TDI Vector after Sean breaches the safehouse in "Sanctuary" (S2E12). Roan (Rob Stewart) and Patrick carry them during the warehouse battle in "Rogue" (S2E14) and "Doublecross" (S02E016).
IMI Uzi
Michael uses an Uzi in Game Change. Oversight sentries carry one in Sanctuary as well.
IMI Mini Uzi
Nikita (Maggie Q) dual-wields a Mini Uzi along with her MP7 in "343 Walnut Lane" after Micheal is hit. Another Mini-Uzi is seen on a long table in "Clawback".
Calico M950
A brainwashed Alice (Julie McNiven) in Falling Ash is armed with a Calico M950 outfitted with a scope when Dr. Mars plays a music file when Owen instructs him to download files for the Regiment.
Rifles
AKM
In "Guardians" (S2E10), GOGOL agents deployed to Switzerland use AKMs with Picatinny railings and modern furniture. Nikita and Owen use them, taken from dead GOGOL agents. GOGOL agents carry the AKMs again during the gunbattle in "Clean Sweep" (S2E13). The customized AKM seemed to have been modeled on the King Arms AK-74 Tapco airsoft gun, and it is possible some of the rifles seen in the background are in fact airsoft guns.
Zastava M70
Tupolev henchmen were armed with the Zastava M70 in "London Calling", Casandra (Helena Mattsson) commandeers one. In "Guardian", GOGOL agents on patrol around the perimeter of the Semak Estate in Russia are armed with Zastava M70AB2s.
AKMS
Armenian Border Guards are armed with the AKMS in Partners. Roan, pretending to be a GOGOL agent, uses one in "Doublecross".
Czech Small Arms Sporter Compact
Some GOGOL agents in "Clean Sweep" and "Power" carry SA vz.58 Compacts, a shortened version of the SA vz.58.
Beretta ARX-160
Nikita uses a Beretta ARX-160 in "Rogue" (S02E14), fighting alongside Michael in the warehouse to save Carla. This is the first appearance of the ARX-160 in a television show. Micheal carries the ARX-160 during the steel mill shootout in "Doublecross" (S2E16) and while holding up a truck in "Shadow Walker".
Colt Law Enforcement Carbine
One of the Division agents in "343 Walnut Lane" carry Colt Law Enforcement Carbines fitted with a telescopic sight. The weapon has also been modified with a number of Magpul accessories, including PMAG with ranger baseplate, a UBR stock and an MOE handguard. The weapon is later picked up and used by Roan (Rob Stewart). Sean Pierce (Dillon Casey) carries the weapon, fitted with a bipod and suppressor, in his amphibious assault on the beach safehouse in "Sanctuary"
IMI Tavor TAR-21
In Falling Ash, Owen uses the Tavor TAR-21 as his main weapon when he and Michael raid Dr. Mar's fake therapy clinic. A few Division operatives uses this in "343 Walnut Lane".
Colt M16A1
Michael (Shane West) uses a Colt M16A1 fitted with an M203 (along with the correct leaf and quadrant sights) in "343 Walnut Lane" (S02E06).
Colt M16A2
US Marines are armed with Colt M16A2s in "Homecoming".
Custom AR-15
Sean Pierce (Dillon Casey) carries Micheal's custom AR-15 from Season 1 during the Gates House battle in "Clean Sweep" (S02E13). Nikita uses it again in "Dead Drop" (S2E21).
M4A1
Division operatives sent to kill Nikita and Michael in "Game Change" are armed with M4A1s with C-More red dot sights. In a flashback, Roan (Rob Stewart) and a team of Division agents use the rifle while disguised as American soldiers. Stock M4A1s are used by Division personnel in "343 Walnut Lane". Michael also uses an M4A1 with Magpul MOE furniture with a C-More Tactical RDS in "Clean Sweep" and a telescopic sight later.
SIG SG 552
The SIG SG 552 appears to be the stand-issue Division assault rifle and are used by Division personnel with, and without the suppressor and C-MORE sight. In Knightfall, a flashback shows Division guards standing guard behind Ramon with 552s. A uniformed Belorussian Presidential Security Service officer uses one in Looking Glass. Division tactical teams are armed with the SG 552 during a raid in Berlin, Germany in Dead Drop.
Shotguns
Benelli Nova
Alex (Lyndsy Fonseca) carries a short-barreled Benelli Nova Tactical version with a dot sight and collapsible stock in "Wrath" (S2E19) and " "Shadow Walker" (S2E20). Birkhoff pick it up and passes it to Sean in "Dead Drop".
Serbu Super Shorty Remington 870 Shotgun
Michael is armed with a Serbu Super Shorty with a foregrip in "Rogue" and "Homecoming".
Valtro PM5
GOGOL operatives carry Valtro PM5 pump-action shotguns with detachable magazines during the forest shootout in Turkey at the end of "Partners" (S2E4). They are seen again in "Arising" as GOGOL operatives ambush an MI6 team.
Sniper Rifles
Ruger 22 Charger
Alex uses a custom Ruger 22 Charger with an extendable buttstock, scope and suppressor in Knightfall.
A Browning M2HB can be partially seen in "Homecoming".
Heckler & Koch HK21
An HK21 machine gun is seen in Nikita's safehouse in "Dead Drop" (S2E21)
M249 Paratrooper SAW
An M249 Paratrooper SAW is seen in Nikita's safehouse in "Doublecross" (S2E16). Birkoff briefly picks it up and loads an M16 magazine into the SAW in "Dead Drop" (S2E21)
Grenades
M67
A M67 is used by Michael to intimidate Division personnel in "Homecoming".
Division Agent Wyatt (Andrew Hinkson) uses a FIM-43 Redeye surface to air missile launcher in "Doublecross" (S2E16), where it is incorrectly depicted as an unguided rocket launcher.
RPG-NH-75
An RPG-NH-75 is used in Switzerland to take out a Swiss police van to retrieve the black box.
Others
Automated Machine Gun
In Partners, an automated machine gun based from an M4-type rifle with a 100-round magazine was used near the Turkey-Armenia border to "shoot" at Nikita.
Cane weapon
Alex was armed with a cane that was actually a firearm in Falling Ash. It was never used since she intervened to save a Senator from being assassinated.