Deputy US Marshal Raylan Givens (Timothy Olyphant) continues to carry a Glock 21 as his sidearm in Season 2.
Glock 17
Nearly all of the other US Marshals in the series carry full size Glocks as their sidearms as well including Chief Deputy Art Mullen (Nick Searcy) and Deputy Marshal Tim Gutterson (Jacob Pitts).
Glock 26
The Glock 26 appears mainly in the series as the sidearm carried by Deputy Marshal Rachel Brooks (Erica Tazel). The Glock 26 also is Raylan's backup weapon.
A nickel plated Colt M1911A1 is seen in the hands of various characters including Dickie Bennett (Jeremy Davies).
Colt Government Model
In Season 2's premiere "The Moonshine War" (S2E01), a Colt Government is pulled on a truck driver by Miami cartel soldier Pilar. The handgun is later seen in the hands of Boyd Crowder.
Walther PPK
A Walther PPK is used to threaten Loretta McCready (Kaitlyn Dever) in "The Moonshine War" (S2E01).
Revolvers
Colt Python
In "The I of the Storm" (S2E03), Doyle Bennett (Joseph Lyle Taylor) is seen carrying a Colt Python as his sidearm. He then pulls the Python on some suspects.
A scoped Ruger Mini-14 is seen used in the bus hijacking in "The I of the Storm" (S2E03). Another scoped Ruger Mini-14 is seen used by Devil (Kevin Rankin) in "Bloody Harlan" (S2E13).
AKM
AKM's are seen throughout Season 2. In Season 2's premiere "The Moonshine War" (S2E01), a cartel gunman is briefly seen opening fire with the AKM from a private jet. The AK rifle is also seen in the hands of some of Mags Bennett's men.