Browning BAR Question

dbransco

Sergeant
Supporter
Full Member
Minuteman
Apr 27, 2010
1,120
193
Oregon
Are there any BAR experts??

I have a BAR with the following serial number 598xx M77. When attempting to look up it’s manufacture date, it appears to have the 1976 and earlier convention; however, has a “77” after the “M”.
Can anyone tell me anything about this?

Thanks!