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In "Remember the Alamo" (S2E02), a flashback to Afghanistan shows Swagger using his camouflage-painted and suppressed Knight's Armament SR-25.
"Black King" (D&L MR-30 PG)
The customized "Black King" .338 Lapua Magnum rifle used in Season 1 is seen again in Swagger's weapons shed in "Don't Mess With Texas" (S2E03). In reality, the rifle seen is a D&L MR-30 PG.
Rifles/Carbines
AKM
The AKM is seen with Taliban fighters.
Colt M4A1
The M4A1 is carried by former members of Swagger's old unit while in Afghanistan, including Isaac Johnson (Omar Epps).
PWS MK107
A PWS MK107 is seen in the hands of Edgar in "The Man Called Noon" (S2E05).
In Season 2's premiere "The Hunting Party" (S2E01), terrorists disguised as German police use Heckler & Koch G36Cs in an attempted hit in Frankfurt. Swagger uses one also during the firefight. Regular police officers in Frankurt use them as well.
Heckler & Koch HK91A2
Mexcian federale police are armed with Heckler & Koch HK91 rifles in "Across the Rio Grande" (S2E06).
Handguns
Beretta 92FS
A Beretta 92FS is used at a local shooting range in "The Man Called Noon" (S2E05).
Colt Gold Cup National Match
A Colt Gold Cup National Match is used by Julie Swagger (Shantel VanSanten) at a local shooting range in "The Dark End of the Street" (S2E04) and in "The Man Called Noon" (S2E05).
FNP-45 Tactical
A FNP-45 Tactical is used in "Don't Mess with Texas" (S2E03) before Isaac uses it.
Glock 17
A Glock 17 is carried by Isaac Johnson (Omar Epps), first seen in "The Hunting Party" (S2E01) while being chased by gunmen in downtown Bangkok. Swagger's unit in Afghanistan use them as their main sidearm. A CIA Special Operations Group unit is seen using them briefly in "Don't Mess with Texas" (S2E03). It shows up with other characters on occasion.
Heckler & Koch VP9
A Heckler & Koch VP9 is seen in Solotov's arms cache in "Don't Mess with Texas" (S2E03).
Heckler & Koch USP
A Heckler & Koch USP is used by Tio in the present day as her official sidearm.
A Walther PPK is used by Solotov in "The Hunting Party" (S2E01).
Smith & Wesson 4505
A gunman wields the Smith & Wesson 4505 pistol in "The Dark End of the Street" (S2E04).
Submachine Guns
Brügger & Thomet MP9
The Brügger & Thomet MP9 is used by gunmen who open fire on Isaac Johnson in "The Man Called Noon" (S2E05).
Heckler & Koch MP7A1
The Heckler & Koch MP7A1 is used by gunmen who open fire on Isaac Johnson and his wife in "The Hunting Party (S2E01).
CZ Vz. 61 E Skorpion
Gunmen who are sent to eliminate Solotov appear to be armed with the CZ Vz. 61 E Skorpion in "Don't Mess with Texas" (S2E03).
Machine Guns
Browning M2HB
Browning M2HBs are used as weapons mounted on various vehicles. Mexican federales have a Browning M2 mounted on an armored vehicle in "Across the Rio Grande" (S2E06).
Mk 48 Mod 0
A Mk 48 Mod 0 is used by a Marine during a firefight in "The Dark End of the Street" (S2E04).
RPK
A RPK LMG is seen with a Taliban fighter in "Remember the Alamo" (S2E02).
Rocket Launchers
RPG-7
The RPG-7 is used by Taliban forces in Afghanistan.