You have to call SIG
You call Sig Sauer
You have to call SIG to find out.
You will have to call SIG to find out.
AFAIK, no.
According to the Sig website, the 220 match has a longer barrel and adjustable target sights.
SIG sn's are not in the public domain. You will have to call them.
You will have to call SIG to find out. No published data.
50-500 usd
The Sig.
You will have to contact SIG and request a letter.
Without a detailed description of all markings, it is impossible to answer.