They never did. 14 ga was never made in any model by Browning
To the best of my recelection the answer is no.
Possible, but, not likely.
No. 12, 16, and 20 gauge only.
No
No
Yes, it has one.
What_is_the_value_of_a_Browning_Sweet_Sixteen
1949
if the gauge and chamber length are the same
50-550 usd
your browning auto-5 shotgun was made in 1928.
see the Browning website