I had one issued M60 that actually worked well. I liked to carry it because it was a little bit of counter balance to my ruck. Loved that old girl, she was always ready to party.
BCT I was issued a XM16, it was louder walking with than when it was fired. I remember when we were issued A2’s and turned in our A1s at my 2nd duty station. Spent about a week shooting up that free Army ammo. Same old aluminum mags, 28 rds loaded because you know why.