The Beretta 92FS is used by LAPD officrs in episode 'Hollywood Shootout', PFLP hostage takers in 'Operation Entebbe' and in 'Moscow Siege' thus making it the most commonly seen gun in the series.
Smith & Wesson Model 10
Smith & Wesson Model 10 are used by Colombian Police officers in episode 'Hunting Pablo Escobar'.
Fake SIG-Sauer P226R
SIG-Sauer P226Rs are used by Pablo Escobar and his bodyguards as their pistol 'Hunting Pablo Escobar' and later seen in the baggage of the PFLP hijackers in 'Operation Entebbe'. This is completely anachronistic as the original non-railed version of the P226 did not come to market until 1985. Pablo Escobar was killed in 1993 and 'Operation Entebbe' happened even earlier, in 1976! The Railed version of the P226 did not even exist until the mid-2000s. In these episodes, most of the examples of the SIG P226R are airsoft pistols. However, the series' armorers may not have been able to get a Beretta 92 due to lack of resources or budget.
Unknown Pistol
An unknown pistol is seen being cocked by Matasareanu in 'Hollywood Shootout'.
Fake MAC-11
A MAC-11 is used by Pablo Escobar's bodyguard in episode 'Hunting Pablo Escobar' and later seen during the ending credits. It seen being changed with a Uzi midway through the episode and in fact his bodyguard really used an Uzi.
IMI Uzi
Uzis are seen in the hands of IDF personnel in 'Assault on Entebbe' when their C-130 lands at Entebbe, however they seem to erroneously change to the AK-47 when the enter the airport building. It is also used by Pablo Escobar's bodyguard in 'Hunting Pablo Escobar'.
IMI Micro Uzi
A IMI Micro Uzi with bent trigger guard is used an IDF personnel to bring a suicide bomber down in 'Assault on Entebbe'.
Sterling SMG
A Sterling SMG is used by a Taliban insurgent in 'Taliban Uprising'.
IMI Tavor CTAR-21
IMI Tavor CTAR-21s are used by Colombian Special Forces in 'Hunting Pablo Escobar'.This is highly anachronistic since Tavors did not exist in 1992 when the incident took place. Colombian Special Forces really uses the Tavor but that is only after 2007.
L85A1
L85A1s are seen in the hands of British soldiers,UN gurads at checkpoint and later captured by the West Side Boys from the British soldiers in 'SAS Jungle Rescue'. The A2 had yet to reach British forces, as it had only begun production in late 2001.
M16A2
Seen prominently in episode-'SAS Jungle Rescue' and 'Hollywood Shootout'
M16A1
Fake M4A1
Seen in the hands of a US Soldier in episode-'Al-Qaeda Ambush'