A SIG-Sauer P226 is the pistol carried by Jack Ryan (John Krasinski) during a raid in "French Connection" (S1E02). However, it appeared that he was given a SIG-Sauer P228 earlier in the episode.
SIG-Sauer P228
In "French Connection" (S1E02), Jack is given what appears to be a SIG-Sauer P228 pistol right before a raid. This pistol appears to turn into a P226 later in the episode. A P228 is also carried by Captain Sandrine Arnaud (Marie-Josée Croze).
The Heckler & Koch HK416 D10RS is used by members of BRI, the SWAT unit of the French National Police. CIA operatives as well as James Greer (Wendell Pierce) also use the HK416.
M4A1 Carbine
The M4A1 Carbine is carried by both soldiers as well as opposing forces. In "Pilot" (S1E01), James Greer (Wendell Pierce) uses an M4A1 to defend the CIA black site against invading forces.
AKS-47
Some enemy fighters are armed with AKS-47 assault rifles during the battle at the CIA black site in "Pilot" (S1E01).
A BRI member appears to be armed with a SIG SG 552 in "French Connection" (S1E02).
Submachine Guns
CZ Scorpion Evo 3 A1
A CZ Scorpion Evo 3 A1 fitted with a suppressor is used by Ali (Haaz Sleiman) in "Pilot" (S1E01). The weapon was hidden in the body of a dead fighter.
Machine Guns
PKM
A PKM light machine gun is seen mounted on enemy technicals in "Pilot" (S1E01).
Browning M2HB (Mocked up as DShK)
Browning M2HB heavy machine guns are mounted on enemy technicals in "Pilot" (S1E01). An APC has a Browning M2 mounted in a turret at the CIA black site in the same episode.
M240B Machine Gun
An M240B machine gun is seen mounted on an enemy technical in "Pilot" (S1E01).