Siege breakers has alot of fun stuff. The leveler's alright, I don't use it but I've seen an uptick in it getting used because of the vox engines on bot side (it'll almost oneshot them). It's also nice for clearing bases, like a 500kg. The trident's also an amazing primary.

For backpack items, alot of the good ones are free, just gotta level up. Dog breath's pretty good, as well as hot dog. Your teammates will hate you if you run the Arc one, get used to putting it away whenever you're near them. Portable hellbomb is goated, but does have somewhat of a long cooldown.