Buyers guide and advise for a first time buyer

I’m looking into getting a new firearm and the Scar 17 is on the list of guns I’m interested in. I wanted to ask this community for some advise though on things I should look out for in buying process and important stuff more specific to the Scar.

First, are there any issues common to a Scar that I should be on the lookout for? Specifically with a used gun, is there something that any of you look at and walk away from that gun? My goal is to get new, but if there isn’t one there or the used is a really good price, that may be where I go to use the rest of my budget in attachments and upgrades.

Which goes into my second question, what are some of the day 1 upgrades you recommend? I see a lot of Geissele triggers, which is something I would want to get for it, but do I need it immediately? Is the factory trigger bad enough to warrant the upgrade immediately? I also see some people trading out the end on the charging handle, is that something worth changing immediately?

In regards to optics, I have seen plenty of lists of ones shooters prefer with this gun, but which ones does the community feel works best? I have read articles and watched videos about how the Scar can damage optics over time. I’m leaning towards vortex razor HD, so the warranty is a nice bonus there, but if the community has some more guidance on better optics or how to protect the optic, that would be helpful (I know optic selection is personal and based on the objective of the firearm itself; I’m going for a marksman rifle set up).

Final big question, I have a 30 caliber suppressor in ATF jail at the moment and I would like to suppress the gun. I know adding the suppressor voids the warranty with FN, but I have seen people modify the firearm to allow for a suppressor. I have seen the Scarburator come up a few times, but are there other components I need to install to prevent any damage to gun? With that, are there certain cans that work better or is it all the same? Additionally, what are some things I need to look for and check when shooting the Scar suppressed? What are some points of failure that I should be concerned with?

Thanks for any guidance anyone can provide. I’m sure these questions get asked/answered a lot. If so, links to other posts are helpful as well.