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The SEALs in the series carry Heckler & Koch HK416 carbines with 10.4-inch barrels, Magpul PMags, Magpul CTR stock, Geissele Super Modular Rail HK handguard, 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.
AK-47
The AK-47 with a gold finish is seen on display in the briefing room of Naval Amphibious Base Coronado.
The AKMS is seen with hostile characters on occasions.
Lee-Enfield No. 1 Mk III
A Lee-Enfield No. 1 Mk III is seen in FOB Fenty's break room.
M4A1 carbine
The M4A1 carbine was the standard weapon of the SEALs in earlier missions.
M16A2
The M16A2 is seen with Afghan National Army soldiers and US Marines.
Flintlock Musket
What appears to be a Jezail musket is mounted on the wall in a flashback seen in "God of War" (S4E01).
SKS
The SKS rifle is seen in FOB Fenty's break room in a flashback.
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 the usual sidearm used by Bravo Team.
Beretta 92FS
Beretta 92FS pistols are seen used throughout the season.
Submachine Guns
Heckler & Koch MP7A1
The Heckler & Koch MP7A1 is another weapon used by the SEALs, typically in CQB situations.
Sniper Rifles
FN SSR
The FN SSR is used by another SEAL in "Forever "War" (S4E02). While the SSR has appeared in a few video games, this seems to be its live-action TV debut.
The Browning M2HB is seen on American military vehicles.
DShK heavy machine gun
The DShK HMG is used by various enemy factions in the show.
FN Mk 46 Mod 1
The FN Mk 46 Mod 1 is one of the machine guns used by SEAL operators, mainly by Sonny. It's outfitted with an EOTech XPS3, G33 magnifier, AN/PEQ-15, Grippod grip, flashlight and a Surefire SOCOM556-MG suppressor.
FN M240 Machine Gun
The FN M240 is seen mounted on US military vehicles on occasions.
PKM
The PKM machine gun is used by enemy forces in the season.
General Dynamics GAU-17/A
A General Dynamics GAU-17/A minigun is mounted on a SEAL ATV in Season 4's premiere "God of War" (S4E01) and "Forever War" (S4E02).