The Beretta 92FS (used in lieu of the Beretta M9) appears as the issued sidearm of various military personnel and in the hands of various characters throughout the series.
A prototype special operations pistol called the "Black Hand" was used in several murders by an ex-military analyst turned assassin in "The Penelope Papers" (S9E03). It's a prop pistol that is based on the SP-21 Barak.
In "Housekeeping" (S9E12), ex-Watcher agent Casey Stratton (Scott Wolf) fires a Desert Eagle. Ziva says that it has .50 caliber bullets, which indicates that its caliber is the .50 Action Express.
Error creating thumbnail: File missingDesert Eagle Mark XIX - .50 AE. The newer Mark XIX models are most distinguishable by the scope rail mount above the barrel, clearly visible here. This is the version of the Desert Eagle popularized by The Matrix, and the most common in current movies and TV shows.Error creating thumbnail: File missingIn "Housekeeping" (S9E12), ex-Watcher agent Casey Stratton (Scott Wolf) firing the .50 Cal Desert Eagle at pursuing NCIS agents.
Glock 17
The Glock 17 is another frequently-used handgun in the series.
In "Restless", Smith & Wesson Model 37 Airweight was seen beside ex-con Curtis when Gibbs and the NCIS team (except Ziva) were approaching him on the roof of a taco restaurant.
Ziva continues to carry a Smith & Wesson Model 340PD as her backup gun, which she carries in an ankle holster. She often is seen dual-wielding the revolver along with her SIG, this time in "Newborn King" (S9E11).
In "Housekeeping" (S9E12), an FBI SWAT agent is armed with the Heckler & Koch MP5A2 fitted with an ACOG scope,weaponlight and laser sight (it's possible that this weapon is an airsoft replica).
Error creating thumbnail: File missingHeckler & Koch MP5A2 9x19mmFile:NCIS FBI SWAT.jpgIn "Housekeeping" (S9E12), an FBI SWAT agent armed with an MP5A3 is seen moving in to arrest Stratton. This MP5A3 has an ACOG-type scope and a laser sight, but for some reason, is missing the barrel.
Heckler & Koch MP5SD2
A Heckler & Koch MP5SD2 is seen in Season 9's "Desperate Man" when Abby shows Gibbs a photo of the SD2.
The M4A1 carbine can be seen used by various US Military personnel and gunmen throughout the series. In "Engaged, Part II" (S9E09), US Marines as well as Gibbs and Ziva are armed with M4A1's during a raid in Afghanistan.
A Heckler & Koch G36C with a mounted suppressor on the barrel is seen in Season 9's "Enemy on the Hill" (S9E04) when Gibbs and Tony uncover the assassin's hidden arms stash in his garage.
In "Housekeeping" (S9E12), ex-Watcher operator Casey Stratton (Scott Wolf) can be seen firing an Airtronic RPG-7, a modernised US manufactured version of the RPG-7.
