What is the vol.2? "Oficially" vol.2 is the 87' run with 104 issues. You have "3" WarZone's, '92 run with 41 issues, Warzone miniseries by Ennis (6 issues) and lastly Rucka's War Zone (5 issues).
If you are liking this current run i would recommend Rucka's run (16 issues + Warzone miniseries), every MAX issues by Ennis and Jason Aaron, Punisher (MK series) written by Ennis in 616 it has 37 issues and of course Welcome Back, Frank (12 issues) by garth Ennis.