Eric Delko Adam Rodriguez uses a SIG-Sauer P226 Elite as his sidearm during season 9. The gun is identifiable as the Elite model because of its beaver-tail.
In "Reality Kills" (S09E06), an activist is seen with a Walther P99QA. Delko initially things the gun is real but later discovers that it is a pellet gun.
Unknown 1911
In "Blood Sugar" (S09E09), Luis Avilla (Ramón Franco) is seen with an unknown 1911 when confronting the man who had his son deported.
Revolvers
Unknown Revolver 1
In "Manhunt" (S09E04), Memmo Fierro (Robert LaSardo) is seen with a Gold Plated revolver which he steals from someone. He later uses it to shoot multiple people at Miami Dade Memorial Hospital.
Unknown Revolver 2
In "See No Evil" (S09E03), a gunman is seen with an unknown revolver which he aims at a blind man.
Submachine Guns
Intratec TEC-9
In "Last Stand" (S09E13), a Mala Noche gangmember is seen with a TEC-9 during a drive-by shooting. As in most films and TV shows, the gun is converted to fully automatic fire.
Assault Rifles
Colt M4A1
In "Reality Kills" (S09E06), an MDPD officer is seen armed with a Colt M4A1. Horatio later takes the gun from him and aims it at a suspect.
In "Happy Birthday" (S09E08), MDPD SWAT officers are seen with Colt M4A1s during a raid on a chop shop.
Unknown AR
In "Fallen" (S09E01), an unknown AR is used as part of a remote shooting platform to ambush the MDPD vehicle transporting Bob Starling, facilitating his escape.
Rifles
Heckler & Koch SR9
In "On the Hook" (S09E07), Dario Aguilar (Joseph Julian Soria) uses a Heckler & Koch SR9 that is chambered for 7.62 but fires a 5.56 round with a Sabot. As Calleigh explains, this allows a smaller caliber bullet to be fired from a higher caliber gun with now groves being left on the bullet.
Ruger Mini-14
In "Fallen" (S09E01), a Ruger Mini-14 is seen pointed at Melissa Walls when the CSIs come to ask her some questions. As it turns out, Melissa set the trap her self to make herself look like a victim.
Shotguns
Unknown Over-Under Shotgun
In "On the Hook" (S09E07), Charles Hayward is seen with an over-under shotgun shooting clays when the cops come to question him.