I guess if someone is worried about availability of parts for a psitol or revelver that they carry and shoot, I would stick with VERY common guns that were issued to LE and military worldwide and were made in huge numbers.

Browning Hi Power P35
Full size 1911 in .45ACP
Glock 17.
Beretta 92 series
SIg P226
S&W K/L frame DA revolvers 38/357

My .02 worth.