A top resource for handguns & pistolsmiths is the American Pistolsmiths Guild.
They list members by type of service or noted work or by the state.
www.americanpistol.com
For pistols & the M&P line; see David Bowie of OH. Bowie(not the rock legend
) is a gunsmith & a sworn LE officer/SWAT commander.
www.bowietacticalconcepts.com
ClydeFrog