It seems to me that he'd be at least tier 2 with just his physical abilities and no weapons, so when you add all his weapons and equipment he hits at least tier 3 even without the goop ability. Add that in and he gets infinite ammo, energy attack resistance (in addition to the bullet and blunt force resistance of his armor) and a tethering ability akin to a less powerful version of spider-man's webbing. If that doesn't bump him up to tier 4, it at least gets him close.

I also have some questions about the goop itself, mostly regarding it's flammability. Given the highly technical nature of all his equipment descriptions, I feel that it isn't too much to ask exactly how the goop can be used for bullets. In a traditional firearm, the projectile is propelled by the combustion of the gunpowder, so does the goop actually alter its physical properties to resemble the form and function of each component in the cartridge? If so, can it also alter itself to take on the properties of other physical objects? Like, for instance, repairing his armor plates after they've been shot or allowing him to materialize a knife if he finds himself weapon-less.