Yep, Frank Castle isn't messing around. One of the very first shots (no pun intended...) is of a cache of guns belong to him, and that's compounded when we see some more heavy artillery in this possession, all of which is intended for the very worst of Hell's Kitchen. As Officer Brett Mahoney puts it, he's got "the knowledge and hardware to take out half the city." That's, er, an awful lot of resources for a one-man wrecking crew. Part of the Punisher's training includes him being highly skilled in the use of special operations weapons, including various types of firearms and explosives, and it certainly seems as though that will be carrying over to the show, meaning he's got a lot of toys to play with.