DEA Agent Sean Vetter (Vin Diesel) uses a Glock 19 pistol to fend off the assassins that come for him in the middle of the night.
M16A2
One of the Cocaine Factory Guards strolls around with an M16A2 (or equivalent clone).
Beretta 92FS
Agent Vetter (Vin Diesel) enters Memo's lair at the beginning PJF raid with a Beretta 92FS given to him to use by one of the Mexican PJF Agents. His Partner (Larenz Tate) is also using one. It is used frequently by other characters in the film.
H&K G3A3
Some of Memo's Guards at his place in Mexico are armed with H&K G3A3's.
H&K MP5SD
The Mexican PJF Agents are armed with Various MP5's; mostly SD (suppressed) models.
Remington 870
One of the Mexican PJF Agents is using a top-folding stock Remington 870 variant with a side shell-storing plate on the receiver.
Winchester 1300 Defender
Memo's Bodyguard tries to use a sawed-off version of the Winchester 1300 Defender against Agent Vetter (Vin Diesel), while Vetter strips him of his weapon and holds it on Memo.
FN FAL
Some of the mercenaries who assault the C-130 cargo plane filled with cocaine are armed with 18" barreled FN FAL's.
AK-47
Many instances of AK's in this movie, some Milled AK-47's, some Stamped AKM's (AK, Modern) and an AKMSU (AK, Modern, Short, Underfolding Stock).
Uzi
One of the Mercenaries hitting the C-130 is using an Uzi.
M4 Carbine
One of the Mercenaries hitting the C-130 is using an M4 Carbine.