Yes, they made it.
You will need to call Browning.
What is the age and value of my Winchester model 70 264 win. mag super grade? Serial # 703942
The M69 suffix identifies your 300 win mag as being a browning BAR that was made in 1969.
By the serial number.
1946 to 2006
Impossible to answer without a detailed description of all markings, finish, barrel length, action type, condition, accessories, box, papers, etc..
How value is Browning 300 Win Mag Semi Automatic
I'm not sure when you posted this question, but I purchased a Winchester 264 win mag a few months ago at a gun auction. I bought it for $350.
100-1000 usd
Need a detailed description
You must call Browning with the serial number.
-80-800 usd