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 a SIG-Sauer P228 pistol right before a raid. This pistol appears to turn into a P226 later in the episode. The P228 later becomes the pistol of choice for Ryan in the remainder of the season. A P228 is also carried by Captain Sandrine Arnaud (Marie-Josée Croze). In "Sources and Methods" (S1E06), both Jack and James Greer are armed with the P228 during a confrontation on the beach, which they use until the end of the season.
SIG-Sauer P229
During a shootout, Jack takes a SIG-Sauer P229 out of car's glove compartment in "The Wolf" (S1E04).
In "Sources and Methods" (S1E06), a Tanfoglio TZ-75 is used by Yazid in a standoff.
Rifles/Carbines
Heckler & Koch HK416
The Heckler & Koch HK416 D10RS is used by Groupes d'Intervention de la Police Nationale operators. CIA operatives, including Matice and James Greer (Wendell Pierce) also use the HK416. US Special Forces are armed with the suppressed HK416 during a rescue mission in "The Boy" (S1E07).
M4A1 Carbine
The M4A1 Carbine is carried by both soldiers and Marines as well as opposing forces. In "Pilot" (S1E01), James Greer (Wendell Pierce) uses an M4A1 to defend the CIA black site against invading forces. In "Inshallah" (S1E08), Jack and other US Marines in Afghanistan are seen carrying the M4A1 during a flashback.
AKS-47
Some enemy fighters are armed with AKS-47 assault rifles during the battle at the CIA black site in "Pilot" (S1E01).
AKS-74U
The AKS-74U is seen in "The French Connection" (S1E02) with members of an ISIL cell in St. Denis.
Suleiman is seen using an under-folder Zastava M70 rifle, as evidenced by the 3-hole front handguard.
SIG SG 552
A GIPN operator 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.
FN P90
Several Secret Service agents are armed with the FN P90 in "Inshallah" (S1E08).
IMI Uzi
An IMI Uzi is seen with a terrorist during a raid on St-Denis in "The French Connection" (S1E02).
Machine Guns
PKM
A PKM light machine gun is seen mounted on enemy technicals in "Pilot" (S1E01).
Browning M2HB
Browning M2HB heavy machine guns are mounted on enemy technicals in "Pilot" (S1E01). A VAB 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).
Launchers
RPG-7
An RPG-7 is seen in the hands of enemy fighters during the attack on the CIA black site in "Pilot" (S1E01).
Grenades
M67 hand grenade
Jack takes an M67 hand grenade off a fallen guard to threaten Sulieman and Ali in "Pilot" (S1E01).
Mk II Hand Grenade
During a flashback, a boy is seen with an Mk II Hand Grenade in "Inshallah" (S1E08).
Others
ISIL Execution Photo
Weapons Caches
A cache of weapons is discovered in a room in "Pilot" (S1E01).