A multifunction tool kit for firearm maintenance has a main tool body having one or more facilities for connection of various tool components. The present invention may include a first tool component having an attachment facility adapted to removably connect to one of the facilities for connection of the main tool body. At least one of the opposing ends of the first tool component may terminate in a feature adapted to fit one or more components on a firearm. A feature may be exposed and extend outwards from the opposing sides of the main tool body when the first tool component is connected to the main tool body. The invention may also include additional tool components, such as a thread protector, an alignment gauge having a grease pot with grease cap, a throat erosion gauge, a spacer with pin punch, a stock liner tool, a muzzle wear gauge, and a handle.