Prices vary by region, but, you are in the 500 USD range.
100-600 depending on specifics
Best left to a trained armorer
You call Sig Sauer
Sig Sauer is the Manufacturers and distributors of ''SIG SAUER'' handguns, Blaser, Sauer and Mauser rifles.
$600 - $900
SIG Sauer's population is 280.
The Sig.
SIG offers factory letters for a resonable price.
100-440 or so
100-700 USD or so
It's pronouce Sig (normally) Sauer (Sour)
You will have to call SIG. They also offer a letter for a resonable price.