The Tokyo Marui AK-Spetsnaz is used by BW terrorists as their main assault rifle. Its model is a slightly modified version of the "TK1B" from Ghost Squad, with the foregrip removed.
Bushmaster ACR
The Bushmaster ACR is seen with GS operators as their main assault rifle.
Sniper Rifles
Accuracy International Arctic Warfare
An Accuracy International Arctic Warfare is seen with Ghost Squad whenever they're required to do sniper work.
Machine Guns
FN Minimi
The FN Minimi is seen mounted in front of the passenger seat of the Desert Patrol Vehicle when GS Alpha Team commandeers it near the end of Mission 3. Some are seen with BW-manned Humvees in Mission 4.
FN M240 Machine Gun
The FN M240 Machine Gun is seen as a weapon icon whenever a machine gun is used during a combat sequence from vehicles.
FN M240D
The FN M240D is seen mounted on vehicles commandeered by GS elements.
General Dynamics GAU-17/A
The General Dynamics GAU-17/A is seen with GS as their main machine gun of choice when mounted on helicopters.
GE M134 Minigun
The GE M134 Minigun is seen as a weapon icon whenever players use the GAU-17/A during a combat sequence. It's seen with the unnamed mohawk boss as his main weapon of choice.
GIAT M621
The GIAT M621 is seen with a BW SuperHind chopper in Mission 4.
XM307 ACSW
The machine guns used by BW forces appear to be based on the XM307 ACSW.
Grenades
AN/M8 HC smoke grenade
An AN/M8 HC smoke grenade is seen with the unnamed bald boss in Mission 1 when he uses it to block the player's vision before closing in with his machete.
M18 smoke grenade
The M18 smoke grenade appears to be used by GS and BW alike to provide non-lethal distractions or cover.
M26 hand grenade
What seem to be M26 hand grenades are seen strapped on the unnamed bald boss, first seen in Mission 1.
M67 hand grenade
The M67 hand grenade is seen as a weapons icon when the game prompts player to use a frag grenade.
The FIM-43 Redeye appears to be used by GS Charlie Team when the BW terrorist mastermind attempts to escape via Mil-Mi-8 Hip chopper at the end of Mission 5.
FIM-92 Stinger
The FIM-92 Stinger is seen as a weapon icon whenever players uses it during a combat sequence.
Pansarskott m/86
The Pansarskott m/86 is seen with the unnamed mohawk boss once his minigun is taken out, first seen in Mission 2. It's seen with the rest of BW in the game, being implied that it's used as their main rocket launcher.
Special Weapons
Cane Gun
A cane disguised as a gun is seen with the unnamed monocle-wearing boss in Mission 5.
Machine Gun Drones
Armed machine gun-type drones are seen in Mission 5.