Diplomatic Siege (also known as Enemy of My Enemy) is a 1999 American production filmed in Romania. In the United States embassy in Bucharest, Romania, Steve Mitchell (Peter Weller) and Erica Long (Daryl Hannah) are pressed to disarm a nuclear bomb left over from the Cold War that's in countdown mode. Serbian terrorists take over the embassy and threaten to kill one hostage every hour if the US does not release their colonel being held for trial at the Hague for war crimes. Meanwhile at the Hague a disgruntled Croatian guard kills the Serbian colonel for massacring his family, so US has to find an impersonator to fool the terrorists in negotiations. Gen. Buck Swain (Tom Berenger) arrives in Bucharest with a US anti-terrorist squad to retake the embassy. And there's a mole on the embassy staff.
CIA agents and some terrorists in the film use M1911A1 pistols.
SIG-Sauer P228
A bodyguard is armed with what appears to be a SIG-Sauer P228 pistol, and not, as has been written previously, a Zastava CZ99. The longer slide and the protruding barrel makes this pistol most likely an airsoft replica.
Members of the US Special Forces in the film are seen using MP40 submachine guns. Since the film was produced in Bosnia-Herzegovina, the SMG was most likely the closest to a western-looking firearm that the armorers could find that actually could be fired (the M16's seen earlier were replicas).
Several characters in movie use early model AIMS (PM md. 63) assault rifles with underfolding stocks and convex forward grips.
AIMR
Some members of the Romanian police special unit carry orignal AIMR (PM md. 80) carbines with 20 round magazines.
M16 Rifle (MGC Replica)
Some of the US Special Forces commanded by General Buck Swain (Tom Berenger) are armed with what appear to be M16 rifles. Closer inspection makes these rifles out to be MGC replicas.
Karabiner 98k
Serbian terrorist Dushan (Mihai Baranga) takes aim with what appears to be a scoped Karabiner 98k rifle.