Universal Soldier: The Return

The weapons seen in this movie are:

M16A2

Used by the US Army when battling the UniSol's.

M16A2 Rifle - 5.56mm. Select Fire rifle (Safe/Semi/3 round Burst Only).

M4A1 with M203 grenade launchers

M4A1 carbines with M203 grenade launchers were seen in the hands of US Army Rangers and Luc Devereux (Jean Claude Van Damme) when they fought the UniSols.

OICW

Used by the UniSol's, And by Van Damme for promotional shots. The "OICW" in this movie was a mocked up MP5 submachine gun with notable parts such as an M16 type magazine and a G3 type for the overhead launcher.