No sn data that I know of
Try e-gunparts.com.
Grininetus BM.
See the related link at the bottom.
Have it examined by a gunsmith.
50-250 USD depending on specifics
@25 years old
US$ 4k-200k, depending on how old the BM is.
It depends on the BM item, but it is normally at 3 years old
50-250 US Dollars
yes
43 years old