...Is there an alt. that will look good but without having to buy expensive equipment?...
No, there is not. Instant, comes in a small bottle, bluing solutions are only fit for touching up some small imperfection to make them less noticeable. The only way to get a quality bluing job is with the proper equipment, know-how, ability to polish metal properly. Bluing a complete gun is a process for a skilled person with the equipment.