Anything metal and LMG has to be heavy. They tend to be monsters in size and built to last before you add big optics and stupid heavy putnick tracer suppressors then comes 3000 is rounds of .32 and a big battery.Looks cool as hell but that's a heavy beast! I've not finished my M249 yet, but i imagine it'll be heavy too once done.
Heavy guns are exactly why i built my short and light M4. With the red dot it comes in at just over 3kg loaded.
I have a really pretty wooden hand guard LCT AKMS which is around 3.3/3.5kg which feels like a stick in comparison and with the RPK drum mag in shoots just as well as the RPK if not better but damm I love the RPK. It gets so many admiring glances and compliments until you hand it to someone and then they can’t wait to give it back.
What was the base M249? What are you planning to do with it?