Other than price, why do you say laser will not do? Engraving or marking?
Your budget may restrict you to Chinese machines or used? Prior to looking you need to define your largest part you need to mount for marking or engraving, barrel? And how much marking engraving you need on a given part, e.g. just BATF requirements or personalization, to determine machine travels. Barrels and cylindrical items may require a rotary axis as well (more money).
Just curious, planning on being a registered FFL manufacturer, or live in a communist state like CA and preparing for passage of a bill requiring all homebuilts old or new to be serialized and taxed (government filing fees)?