There is no such weapon made by Browning. Browning does make a semi-auto of the BAR in 30-06. You can download or request a manual from the Browning web site.
Browning made the first sucessful semi auto shotgun over 100 years ago, along with semi auto rifles (BAR from WW 1) pistols (Browning Hi Power from 1935) and machine guns (.50 caliber Browning)
Browning does not make a M70 semi auto 7mm nag
He was an inventor.
YOu will have to call Browning for the decade.
They refer to this handgun as the browning model BDA (browning double action auto) pistol.
what is your question?
This is an Auto-5 Browning made in 1953
Sn can help. Contact Browning.
You will have to call Browning with the serial number.
It's best left to a gunsmith. Look one up and see if he will let you look on as it is done. Many steps are required.
It is the lightweight version of the Browning Auto-5 semi-automatic shotgun.