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The SEALs in the series carry Heckler & Koch HK416 carbines with 14.5-inch barrels, Magpul PMags, Magpul CTR stock, EOTech XPS3, Magpul RVG, Surefire M300 Scout mounted on a Unity Tactical Fusion and a Surefire SOCOM-RC2 556 suppressor. All the HK416 carbines are painted in dark earth camo. HK416s with simunition conversion kits and BlueCan adaptors attached to their muzzles during training exercises.
AK-47
The AK-47 with a gold finish is seen in "All Along the Watchtower: Part 1" (S3E05).
AKM
The AKM is usually seen with hostiles in the season.
AKMS
The AKMS with rails is seen with some Bravo Team members in "Welcome to the Refuge" (S3E01). Regular ones are seen with bad guys in some episodes.
AKMSU
AKMSUs with rails are seen with Iranian contractors near the end of "Theory and Methodology" (S3E03).
Simunition AKS-47
SEALs use AKS-47s outfitted to fire simunition rounds in training ops.
Zastava M70AB2
The Zastava M70AB2 is seen with hostile forces in the season.
Pistols
Glock 17
Both suppressed and unsuppressed Glock 17 pistols are seen used by SEALs and other characters in the series.
Glock 19
The Glock 19 is used by Bravo Team. Glock 19s with blue slides and/or bodies are used as simunition pistols during training ops.
Simunition Glock 19
Beretta 92FS
Beretta 92FS pistols are seen used throughout the season.
Revolvers
Unknown
Submachine Guns
EKOL ASI Uzi
Some gunmen are armed with what appear to be blank-firing EKOL ASI Uzis in "Ignore and Override" (S3E02).
The Heckler & Koch MP5A3 is seen with an armed man in "Welcome to the Refuge" (S3E01). Other forces use the weapon as well in the series.
Heckler & Koch MP5SD
The Heckler & Koch MP5SD is seen with Serbian Gendarmery officers in "Welcome to the Refuge" (S3E01).
Shotguns
Custom Shortened Remington 870
What appears to be a shortened Remington 870 is used by Sonny as his weapon when needed to breach doors and other hard to get places.
Sniper Rifles
Zastava M76
A Zastava M76 with a suppressor is used by Clay Spenser (Max Thieriot) when he conducts overwatch in "Welcome to the Refuge" (S3E01).
Machine Guns
Browning M2
The Browning M2HB is seen with American military vehicles and emplacements in the series.
FN Mk 46 Mod 1
The FN Mk 46 Mod 1 is one of the machine guns used by SEAL operators, mainly by Sonny Quinn (A.J. Buckley). It's outfitted with an Eotech XPS3, G33 magnifier, AN/PEQ-15, Grippod grip, flashlight and a Surefire SOCOM556-MG suppressor.
FN Mk 48 Mod 1
The FN Mk 48 Mod 1 is another machine gun used by Sonny for certain missions. It's outfitted with Elcan SpectreDR and a Magpul RVG grip.
PK
A PK machine gun appears to be used by enemy forces in "Theory and Methodology" (S3E03).