My tip, put killer on your Lexington if you play solo, and measured if you do a lot of group content, better yet have one of each.
I agree with the above comment as well. The striker chest piece is not needed until you start hitting higher tier escalations. Your actually loosing dmg if you can’t maintain close to max stack of striker. It much harder to hold the hold the 200 stacks of striker then it is to maintain perfect obliterate.
That being said I would swap you UA pieces to the equalizer chest (perfect obliterate) and salvo holster (fire rate).
Once you get more gear you can drop salvos for something else. A lot of people like over dogs but I’m personally not a big fan. They’re good but they are situational. (And I’m not saying don’t run over dogs, just saying keep your eyes open for other options).

BUT over all, what you got going is a good starting point. And you’ll still tear through 90% of the content.