Call Tim Hafer, IIRC he also does cerakoting. His new shop is on 40 just west of town.
I know you asked about Hagerstown, but uphold may also want to check out bollingers in taneytown. They've done some bery nice work and post pictures in their IP section.
Yes we do cerakote finishes. Hydrographic dipping. Machining. Threading. Accurizing. Custom built firearms too. Stop in and check out our new show room with full inventory and introduce yourself.
Thank you
Tim Hafer