The SIG-Sauer P226 is carried by Detective Sergeant Emer Berry (Angeline Ball) and Detective Garda Sean Prendergast (Aaron Monaghan), members of the Garda Special Detective Unit (SDU) assigned to the Criminal Assets Bureau. Various members of the Garda Emergency Response Unit (ERU) are also seen with them holstered in Episode 1. David (Matthieu Sys) uses a suppressed P226 in Episode 6.
Glock 17
The Glock 17 is carried by various members of the Belgian Federal Police, including Chief Inspector Christian De Jong (Wouter Hendrickx) and his colleagues throughout the series. An assassin in Ireland is also seen using a Glock 17 in Episode 1, and Garda Detective Sergeant Emer Berry (Angeline Ball) is authorised to carry one in Belgium in Episode 6.
The Heckler & Koch MP7 is seen carried by multiple members of the Garda Emergency Response Unit (ERU), including the ERU Commander (Nigel Mercier) throughout the series.
Heckler & Koch MP5
Variants of the Heckler & Koch MP5 are seen carried by members of the Belgian Army in S01E04 and officers with the Belgian Federal Police Directorate of Special Units (DSU) in S01E05.
Shotguns
Mossberg 590
A Mossberg 590 is carried by a Belgian Federal Police detective in S01E05.
Rifles
FN FNC
The FN FNC is seen carried by a Belgian Army soldier in S01E04.
M4A1
A variant of the M4A1 is carried by multiple members of the Belgian Federal Police Directorate of Special Units (DSU) in S01E05.
Other
Taser X26
The Taser X26 is seen holstered by multiple members of the Garda Emergency Response Unit (ERU) throughout the series.