I have used these guys for work related laser marking:
Indy :Laser Scribe - 5245 Commerce Circle, Indianapolis, IN. 46237. (317) 859-1397 LaserScribe: The Laser Engraving Specialists
Lafayette: RD LaserCut - 6608 Indian Meadow Lane, West Lafayette, IN 47906. (765)464-8935 RD Lasercut - Laser Engraving and Marking
LaserScribe is also lised in the Class III thread on engravers, so I am gussing they have no issues with firearms parts
https://www.indianagunowners.com/forums/class_iii_nfa/191412-need_engraving.html
booya- which one ?
In Columbus area: Dave Carothers at Max's Jewelry, 401 Washington St. (downtown), Columbus, IN 47201. 812-379-4572. Dave can work with either metal or wood. He's a "gun nut" and nice guy to boot.