Where does someone get an opinion like this?
From this thread

Doesn’t the gun come with a suppressor setting?

Best thing to do would be to call FN vs taking an internet ninja warriors word.

https://fnamerica.com/customer-support/service-repairs/

As long as you use a can with low back pressure i.e. Surefire, Dead Air , you should never need to use their shitty warranty.

Seems like the fine print tells you what you need to do, which is to send your firearm back to FN in the factory configuration.

"Hi, my rifle broke. Pls fix."

This. Run whatever sweet setup you want with gas jet/suppressor and then buy a used barrel setup on the cheap and keep it in the closet in case you ever need warranty work

This is why I always laugh I see people selling off all of their factory parts.

Let us know if you ever find one of those (in factory config).

They come up often enough for a bit under $700. Still a pricy part to just stash away.

Amen. Can't figure out why that is so hard for some to understand. Have an issue, put gun back to normal and if issue is still there send in for warranty work. Easy peasy.

The short version is if the suppressor caused the damage then you likely will not be getting the work covered under warranty. Suppressors, some much more so than others, substantially increase carrier velocity and you will tend to see certain failure points if the gun is run with them for extended periods especially if the ammo is deficient in some way as well (ie hot loaded/high pressure, improper pressure curve, etc).  While you likely wont see an issue with say a surefire socom 2 or a QD702 (yes, I know those are not available commercially), it's important to understand what the suppressor is doing to the gun before you put several thousand rounds down the pipe.

Just my own two cents there.

The barrel isnt the part on a 17 where you would see failure if you're running a can that is way overgassing the gun/overspeeding the carrier. Even if you throw the stock barrel/brake on, do you really think the service department hasn't seen what happens when this is the case?

So, just in case you don't own a SCAR and aren't familiar with its function. Gas at some high psi hits the piston which moves rearward actuating the carrier. Full gas setting allows normal operation, suppressed setting does not as there is far less gas hitting the piston. Adding the suppressor obviously pushes gas against the cartridge and piston which actuate's the carrier. Further tuning your rifle by changing out the gas screw, and FNH makes a lot of sizes just for this, allows you more control over your gas to piston pressure. All this adjustability in the system will give you full control over your carrier speed so that you don't let your gun beat itself to death. Common sense you'd think.

FNH ships the rifles with a generic size gas screw so that it'll operate with a wide variety of ammunitions both good and bad. Reducing the gas is a normal thing on ARs by adding an adjustable gas block, same thing with FNH and the different gas screws.

But if they have a general protocol for diagnosing damage from a can, you are fucked.

And this all comes down to determining if they all have the same failure mode or certain tell tale signs. I think people have spun this up into a much larger issue than it needs to be, because if I recall, it was one person who had a major issue and FN wouldn't warrant the rifle. I would venture there was something more going on there that we don't know about. However, if I blow up my rifle due to my negligence, and have to pay $1000.00 to fix it, well, that's my fault.

Think about how many people shoot 17's with suppressors and how few have issues that are verbal about it.

Well, if you read the thread, you may have noticed I was directly referencing a post from a major suppressor manufacturer talking about FN doing what I posted about. I wasn't pulling that out of nowhere or being an "internet ninja". I suppose FN's warranty info in this thread backs it up though, doesn't it?

So ONE person that post this on Facebook, doesn't post all the details, doesn't post FNH full response as to what failed or why it occured.........and this is the ONE case that that people now base this claim of not shooting your SCAR with a suppressor because FN will void the warranty.

Let's see all the facts first please before jumping to conclusions.

I recently "blew" up my FNP Tactical. I didn't expect FN to warranty it as I was using another's handloads and I'm pretty sure that one round was double charged, and they were +P to begin with. My stupid mistake and it cost me a $1,000 pistol. Point is no one has presented any of the pertinent facts to the SCAR case and no one has any idea what kind of foolishness that may have occurred on the guys part that caused the failure.