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What appears to be a Remington Model 700 is seen in a pickup in "Backroads" (S3E01).
Rifles/Carbines
AKM
The AKM is seen used by VC fighters in "Sins of the Father" (S3E03).
Colt LE Carbine
What appears to be a Colt LE Carbine is seen with a Beckett County Sheriff Deputy in "Backroads" (S3E01).
Sporter Pattern 14 Enfield
During a flashback, a young Bob Lee is seen armed with a Sporter Pattern 1914 Enfield while hunting with his father in Season 3's premiere "Backroads" (S3E01).
Daniel Defense M4A1
What appears to be the Daniel Defense DDM4 "M4A1" is used by operatives in "Backroads" (S3E01).
Charleville 1766
What appears to be a Charleville 1766 flintlock musket is displayed in the office of Red Bama Junior (Eric Ladin) in "Red Meat" (S3E02).
M16A1
Members of Earl Swagger's squad in Vietnam carry the M16A1 in "Sins of the Father" (S3E03). Swagger and other recruits in an intelligence training program are seen trying to assemble the rifle in the same episode.
Pistols
Beretta 92FS
A Beretta 92FS is used by operatives in Season 3's premiere "Backroads" (S3E01) and with an armed civilian in the same episode and in "Red Meat" (S3E02) while an armed robber uses it too.
Colt Government Model
A Colt Government Model is used by Julie Swagger (Shantel VanSanten) as her sidearm in the season. A similar pistol was carried by his father Earl in Season 3's premiere "Backroads" (S3E01). It appears to be seen in a stash by Nadine in "Red Meat" (S3E02).
FN FNP-45 Tactical
An FN FNP-45 Tactical is used by an Atlas operative in "Sins of the Father" (S3E03). This pistol is also handled by Carlita (Felisha Terrell) in the same episode.
Glock 17
A Glock 17 is carried by Isaac Johnson (Omar Epps) in the season. It's also carried by law enforcement officers/agents.
Kahr K9
Nadine is seen armed with a blued Kahr K9 in "Sins of the Father" (S3E03).
Smith & Wesson M&P Shield
The subcompact version of the Smith & Wesson M&P Shield that was used in Season 2's finale by both Bob Lee and Solotov continues to be seen in Season 3's premiere "Backroads" (S3E01).
Johnny Poole (Billy Lush) is seen holding an Ithaca 37 shotgun in "Red Meat" (S3E02). Bob Lee later takes the shotgun and empties the shells in the episode.
Grenades
Model 7290
The Model 7290 is seen inside a bag in "Red Meat" (S3E02).
Others
Gun Rack
A gun rack is seen in the sheriff's office in "Backroads" (S3E01).