If you are lookng for a place that will engrave while you wait in the Dayton OH area, might I suggest using Budde Sheet Metal Works Inc. I first used these guys around 7yrs ago for my GSG5 that I SBR'd and they did a great job. Well I visited them again yesterday for my SBR'd AR and once again the experience was awesome.
Afterwards Ryan gave me a tour of the facility and showed me the new 1 million dollar fiber optic laser machine, all they were missing was the shark. It was impressive to say the least. It was nice as the lady in the office remembers me from 7yrs ago(which doesn't surprise me given I'm a Brit) but she also remembered my son and asked after him which made me feel good. My son has just been accepted into the Dayton Regional STEM School which I brought up, and Ryan suggested bringing him back for a tour of the facility. They are great people and extremely friendly.
Anyway, Budde have been around for 100yrs, which again is impressive, so for all your laser engraving needs lets supports local who just so happen to be firearm enthusiasts to boot.
Budde Sheet Metal Works Inc
305 Leo St, Dayton, OH 45404
(937) 224-0868
Ask for Ryan as he would be taking care of you....