The SIG Pro SP 2022 is used as the main sidearm for the majority of French National Police officers and Brigade criminelle (Criminal Brigade) detectives, including Commander Elise Wassermann (Clémence Poésy), Lieutenant Louise Renard (Juliette Navis), Lieutenant Philippe Viot (Cédric Vieira), Officer Julie (Fanny Leurent) and Brigadier Garrido (Eric Savin).
British Transport Police officers who apprehend Olena Bahkia are briefly seen with holstered Glock 17's as their sidearms. MI6 Officer Neil Grey (Con O'Neill) and other intelligence operatives, as well as the armed response officers who accompany him in Episode 8 also carry Glocks as their sidearms.
Thibaut Briand (Nicolas Wanczycki) carries a Star 30M as his sidearm during the "Defense" attack on the Calais police station to break out Rosa Persaud (Hannah John-Kamen). Brigadier Garrido (Eric Savin), the corrupt officer who aids them, is briefly seen handling Thibaut's 30M also.
TT-33
A "Defence" terrorist uses a TT-33 to shoot a Police officer in the Calais police station attack.
Makarov PM
Eryka Klein (Laura de Boer) draws a Makarov PM on Commander Elise Wassermann (Clémence Poésy) after her true identity is uncovered, later using it to shoot Commander Olivier Pujol during her escape. Pujol later refers to the weapon as a "Makarov 9mm".
CZ75 "Pre-B"
Max Borin (Duran Fulton Brown), a henchman working for Artem Baturin/Koba and The Chemist, carries a CZ 75 "Pre-B" as his sidearm.
Submachine Guns
Heckler & Koch MP5A3
Some of the armed RAID officers who respond to the terrorist threat at Lille University and the Calais police station use Heckler & Koch MP5A3s with and without folding stocks and taclights. A few of them have EOTech sights mounted on the upper receiver via picatinny railing. The armed response officers who accompany MI5 officer Neil Grey (Con O'Neill) in the series finale also carry MP5A3's.
Assault Rifles
Heckler & Koch G36
British Transport Police officers who apprehend Olena Bahkia carry Heckler & Koch G36C assault rifles. Some RAID operatives who respond to the terrorist threat at Lille University and the Calais police station attack are also seen armed with G36C's and G36K's.
AKS-74U
Thibaut Briand (Nicolas Wanczycki) and another "Defence" terrorist carry AKS-74U's during their attack on the Calais police station to break out Rosa Persaud (Hannah John-Kamen).
Sniper Rifles
Blaser R93 LRS2
Thibaut Briand (Nicolas Wanczycki), a member of the "Defence" terrorist group, uses a suppressed Blaser R93 LRS2 to carry out his shooting at the "Fun, Faith and Friends" interfaith meetup in Arras. He uses it to kill one Christian, one Jew and one Muslim. He later incorrectly refers to it as a "shotgun".
Other
X26 Taser
British Transport Police officers who apprehend Olena Bahkia are also briefly seen with holstered X26 Taser's.