Impossible to answer without knowing who made it.
No sn data in the public domain.
No sn data in the pubic domain.The H&R model 306 ultra semi-auto rifle was made from 1965-1977.
Pretty much impossible to so with just the sn.
Sometime between May 1982 (sn 351081 and Dec 1984 (sn 359880)
No known sn data published in English
No published sn data.
No sn data I know of
No published sn data
No sn data available
Browning.com has a sn function under customer service.
No published sn data.
No published sn data in the public domain.