I think we need a new sub forum for people to discuss this weapon. People can then discuss the drop rates and locations with monotonous regularity in there!
Its like the continuous circle of life! The script for m4a1 discussion reads:
Where is the best place to farm it.
They nerfed it
I only got 1 in 2 days
Where is the best place to farm it
They nerfed it
I got 5 in 10 attempts.
repeat 500 times.