If you are talking about a semi-auto belt-fed gun, they are fun until the "New" wears off.
They are heavy, require alot of tinkering, have lots of tools and accessories, tripods, and other heavy and unwieldy things that
have to go with them when you go to the range.
Ammo is not cheap, and after a while, linking belts becomes a chore.
They become such a chore to pack up, move to the range, set up, shoot, pack back up and clean that eventually
you won't take it out anymore.
When referring to taking my old 1919 out, my old saying used to be "Anything less than 1000 rounds is not worth getting the gun dirty".
Mine was a beauty, and I enjoyed it 10 years ago when surplus .308 was cheap and plentiful, but after a couple of years and the "cool factor"
of owning a belt-fed wore off, it sat and collected dust.
I got rid of it last year and haven't missed it.