The Glock 19 is a pistol.
NCIS[]
It first appeared in the NCIS Season 4 episode, Once a Crook (episode).
It later reappeared once again in the NCIS Season 6 episode, Dead Reckoning (episode).
It appeared many times in NCIS Season 8.
It appeared in the NCIS Season 10 premiere episode, Extreme Prejudice (episode) and the NCIS Season 10 episode, Devil's Trifecta (episode).
It appeared in various episodes of NCIS Season 11.
NCIS: Los Angeles[]
It appeared in two episodes of NCIS: Los Angeles Season 1.
It appeared in three episodes of NCIS: Los Angeles Season 2.
It appeared in two episodes of NCIS: Los Angeles Season 3.
It appeared in three episodes of NCIS: Los Angeles Season 4.
NCIS: New Orleans[]
It appeared in the NCIS: New Orleans Season 1 episodes, The Recruits (episode) and More Now (episode).
NCIS: Hawaii[]
The field agents of the NCIS Hawaii Team all carry 5th Generation Glock 19 as their personal sidearms. However, Kai Holman only used the Glock 19 for two episodes before switching to the SIG-Sauer P229 E2.
In addition to the NCIS Hawaii team with the exception of Kai who are all using the Glock 19 as their sidearm, other law enforcement officers and even agents from other agencies have been seen wielding the Glock 19 as their official sidearm.