I’m gonna go ahead and disagree.
There’s a lot more than goes into a quality rifle that will be reliable and accurate for as long as you need it than just a trigger and optic.
I am a huge proponent of quality optics, but if you but a good RDS or LPVO on a turd of a rifle, you still have a turd of a rifle.
If you don’t know how to shoot, a “better” trigger and optic won’t improve things.
If the carbine is made of sub-par components, it won’t last very long.
Buy quality, buy once, cry once.
A complete upper from a quality manufacturer that has the qualities you want, coupled with a quality lower, built with quality parts, will suit you fine for years to come.