Thomas Jane talked to Wizard magazine about what kind of arsenal The Punisher will be using in the upcoming adaptation. Here's the bit...
"I have a couple of sawed-off shotguns," says Jane. "I have a machine pistol with an extender arm. A bunch of claymore mines, an M4 with a grenade launcher. This [film] is 'Year One,' so what Frank has in this he cannibalized or he had himself saved in his army locker box from when he was serving as an army ranger."
Jane will also be seen using twin 45-caliber pistols, guns that in the film belonged to career military man Frank Castle Sr., played by Roy Scheider.