This category will probably need to be broken up into sections since there are at least 4 “production” FAVs let alone all the one offs and misc types.
FAV Mutts were USMC and Navy Seal Units built to use in Fast Attack situations well into the ninetys. There are several different set ups do to the fact that they were unit built on base with materials at hand.
The FAV MUTT were the last of the M151's to see active service and were deployed to many hot spots during the 80's and 90's.
Below is a list of the M151 FAVs That I have documented. These are what would be called “production”. Meaning more than one made and all subsequent ones (Undetermined amount, but enough to be at least 10 or more).