Adam Monroe (David Anders) wields an M1911A1 in "Truth & Consequences" (S2E10).
Makarov PM
In "The Line" (S2E06), what appears to be a Makarov PM is seen in the hands of Noah Bennet (Jack Coleman), a.k.a. The Man in the Horn-Rimmed Glasses.
Smith & Wesson Model 36
In "Cautionary Tales" (S2E09), Noah Bennet (Jack Coleman) hands his Smith & Wesson Model 36 to his wife Sandra (Ashley Crow). In "Truth & Consequences" (S2E10), Sandra is seen holding the revolver on Bob Bishop (Stephen Tobolowsky) when he comes to her home.
Vektor CP1
At the end of "Four Months Later..." (S2E01) and in "Lizards" (S2E02), Ricky (Holt McCallany) brandishes what appears to be a two tone Vektor CP1. A Mexican Coyote also carries a Vektor in (S2E01).
Sig Sauer P226
In "The Kindness of Strangers" (S2E04), a robber attempts to rob Monica Dawson's (Dana Davis) place of work with what appears to be a Sig Sauer P226.
Smith & Wesson Model 19
In "Truth & Consequences", Company security guards arresting Adam Monroe (David Anders) in 1977 appear to be carrying holstered Smith & Wesson Model 19 revolvers.
Beretta Cougar Inox
At least one New Orleans gang member, Hype Wilson (Cory Hardrict) carries a Beretta Cougar Inox in "Truth & Consequences" (S2E10). In "Powerless" (S2E11), Niki Sanders (Ali Larter) also uses the Beretta Cougar.
Smith & Wesson 6906
What appears to be a Smith & Wesson 6906 is used by a New Orleans gang member in "Truth & Consequences" (S2E10).
Rifles & Muskets
Winchester Model 70
One of the Citizens Border Patrol members encountered at U.S border in "The Line" (S2E06) appears to be armed with a Winchester Model 70 rifle.
Tanegashima Matchlock Musket
Whitebeard's men in 1671 Japan use what appear to be Tanegashima Matchlock Muskets in "The Line" (S2E06).
In "Fight or Flight" (S2E05), Maury Parkman (Alan Blumenfeld) uses what appears to be a Remington 870 when he is confronted by his son, Matt Parkman (Greg Grunberg) and Nathan Petrelli (Adrian Pasdar), the shotgun is then held by Nathan after he is disarmed of it.
Mossberg 500A Field Gun
One of the Citizen Border Patrol members encountered by Maya (Dania Ramirez), Alejandro (Shalim Ortiz), and Sylar (Zachary Quinto) encounter at the U.S border in "The Line" (S2E06) carries a Mossberg 500A Field Gun.
Miscellaneous
X26 Taser
In "Fight or Flight" (S2E05), Mohinder (Sendhil Ramamurthy) is given an X26 Taser by Bob Bishop (Stephen Tobolowsky) for a company assignment, it is then used moments later.