With the use of his ability Garrick essentially 3D prints his stuff with the main difference being that he can do just about any material, allowing him to make things without a lot of the little bits.

In the matter of guns he primarily uses sniper rifles, however he also uses assault rifles as well genuinely single shot but will use auto for cover fire. Since all his guns are made by him they're very hard to break, jam or over heat and have a greater efficiency over regular mass produced, in short his stuff's just a whole lot better quality than what you're going to find just about anywhere else.

His surburban is essentially a light tank from the future since the walls and windows can withstand anything short of a few anti-tank rounds (unfortuanly in super human terms that's often very small). Aside from it's armor its got a light turret which is concealed on top which does a transformers like unfolded before going all out dakka dakka, and it's got over 180 degrees of direction it can shoot in and a hefty amount of ammo (its got a limit on spinning in circles since it's essentially backpack fed). The truck is powered by a small nuclear fusion generator, also naturally has an electric motor, and due to its massive weight its got heavy duty suspension and wheels tucked away in the very normal looking truck (nothing actually looks heavy duty they're just stronger alloys than tyoical stuff).

Despite being a salesman and scientist he only sells stuff just ahead of the curve so he's not selling any fusion reactors (and therefore bombs) yet.