The Strayer Voigt Infinity handgun is featured prominently throughout Heroes. The pistol is seen carried by several characters in Season 1, notably Noah Bennet a.k.a. The Man in the Horn-Rimmed Glasses (Jack Coleman), Mr. Linderman (Malcolm McDowell), and Mr. Thompson (Eric Roberts). Essentially, if a character is associated with The Company there's a good chance they'll be packing this pistol.
LAPD Officer Matt Parkman (Greg Grunberg) carries a police issue Beretta 92FS that he draws in several episodes of Season 1. In "One Giant Leap" (S1E03), Matt uses his Beretta to save FBI Special Agent Audrey Hanson (Clea DuVall) by firing a few shots at Sylar (Zachary Quinto) when he has her gun turned on her, to which the villain gets back up seemingly unharmed. Disguised as a security guard, Ando Masahashi pulls a Beretta on a future version of his friend Hiro in ".07%" (S1E19).
Glock 19
In the episode One Giant Leap, FBI Agent Audrey Hanson (Clea DuVall) can be seen chasing Sylar (Zachary Quinto) with a Glock 19 handgun. She tries to arrest him but the villain uses his Telekinesis to turn her own gun but she is saved when Matt (Greg Grunberg) knocks him down with several shots from his Beretta.
Strayer Voigt Infinity Tiki-T
A Strayer Voigt Infinity Tiki-T was seen in episode 7 of season 3 used by Daphne the super speedster on Matt. She gave up and dropped it. You can see the word Infinity on the side of the gun.
Noah Bennet owns a Smith & Wesson Model 36. He uses this gun when Matt Parkman and Ted Sprague break into his home, though Ted manages to take it from him. Noah later lends this gun to his wife Sandra, who points it at Bob Bishop when he comes to her home.
A Sphinx AT380 Pistol seen in the hands of several different people in various different scenes throughout the first episode of season three. In the opening scene Claire uses it to try to shoot Peter, who freezes time and takes it from her, then uses it to shoot Nathan, then stashes it. When he comes back later to retrieve it Matt has it and he confronts Peter about it.
Sile was a distributor of the Sphinx AT380 made in Switzerland.
Beretta Cougar
Used by the ranger in season 1.
Rifles
Blaser R93 LRS2
Jessica, Niki's alternate personality, bought a Blaser R93 LRS2 Sniper Rifle and used it to try to kill D.L. The dealer said that the rifle was a "Kinsella 320Z." However, no such rifle actually exists or the amount she paid with would be worth it for the seller.