Gun List:

Milkor MGL / 40 MM HE 
Colt Python / .357 MAG
Tippman Marker Pepperball Gun / Pepperballs
M26 taser / 2 Electric Probes
HK MP5A4 / 9x19
HK G36C / 5.56x45
Walther PPQ / 9x19
Glock (19) / 9x19
SpringField Armory, INC M14 SOCOM / 7.62x51
HK UMP / .40 or .45

Beretta M9FS / 9x19
FN Five-seveN / 5.7×28mm

FN P90 / 5.7x28mm

Uzi / 9x19
Benelli M4 / 12 Gauge
Walther MPL / 9x19
Remington 870 MCS Tactical / 12 Gauge
Colt M4A1 / 5.56x45

M16A3 / 5.56x45

FN MK.16 MOD (scar) / 5.56x45
M24 / .308 or 7.62x51
FN FAL / 7.62x51
Armalite AR-18 / 5.56x45
Mossberg 500 / 12 Gauge

Colt 1911 / .45 ACP 

Remington 870 Less than Lethal Shotgun / Bean Bags

 

Not Seen yet in released content but also thought to be in the game:

Benelli Nova / 12 Gauge  

 

Grenades:

m7a3 riot cs
model 9590 stingball
M84 stun grenade
9-Bang

 

Accessories: 

EoTech
Aimpoint M2
TLR2 LED Taclight
Vortex Optic Venon Red Dot

 

Equipment:

MICH-2000
Opscore High Cuts
AN/PVS 7's generation 3
AN/PVS 15's
3M Peltor ComTac III
S10 NBC Gas Mask
Scott M98
TL-122 Army Flashlight
Condor Cyclone
Salvadoran ERDL camouflage

 

Credits: VP, Criminale, Eezstreet, and Martin F.