Pistols - 512x512 textures - Combined (diffuse+ao), normal maps. Everything else - 1024x1024 textures - Combined (diffuse+ao), normal maps. Additional metal/roughness maps. If you want to have PBR, however, I didnt spend much time setting them up corectly, so you might want to use your image editing soft to tweak contrast and brighness, depending on your engine. Mostly inspired by early-mid 2000th style of combined texture + normal map.
Not rigged, but vertex groups include basic stuff like cylinder, slide, etc, so you can rig it yourself easily. Magazines are separate models for all guns. For revolvers, magazines are 6 cartridges in their cylinder.
Triangles:Pistol - 1,624.Revolver - 1,240.Heavy Revolver - 1,268.Heavy Compact SMG - 2,186.Assault Rifle - 2,612.Burst Rifle - 3,540.Pump Shotgun - 1,314.Bolt Action Sniper Rifle - 1,446.
P.S.: If people would be interested in this, I'll make much more guns/items in this style, or if you want custom models in this style, feel free to contact me.