I pronounce FAMAS as fah-miss (don't know why, I just always have).
I say awg sometimes, aye-yoo-gee others.
I say either Tavor or just simply tar, never tar-21 or tee-aye-arr 21.
I used to say Fahl but now I always call it the Fabrique Nationale eff-aye-ell.
SCAR is scar, not ess-see-aye-arr.
Something weird that I heard recently was the ack-four-seven. I was just flabbergasted at that one.