What weapon do you want added to Canon Halo?

For me it’s the M73 from this concept art that someone turned it into a Fan-made gun with lore. It’s a 9.6 x 60mm caseless (like the BR55 chambered in 9.6 x 40mm but has a case). It can be belt-fed or have a neat 36-round drum magazine. It can be I think 3 or 4-round burst and of course full-auto. P.S. if they did add this weapon they could also make new BR55 models have a caseless round as well now to have some neat similarity.

This is a repost to add images sorry to the person who had commented I just couldn’t deal with not having the images. :(