I attempted to do the SBR conversion on my PS90 and got the take down button stuck and can not get it to return. Any help or ideas to try before I contact customer support?

Is the bolt carrier in correctly? Ive done that. Was upsidedown

currently it is just the receiver, no stock, charging handle, barrel, etc.  I also do not know how to take the button out to see if there is any damage.

Attached File

The barrel goes through the button, so you should be able to get a tool in there to pry the button back up.

So gave FN CS a chance to be helpful and to all those that know FN CS is near worthless.  Anyone recommend someone to send the receiver to take a look at it and give a thumbs up or down on if it is useable at least or at best to determine what the issue is?

How weird did the button feel when you depressed it the first time?

If it has any spring resistance at all, I'd attempt to center it in its hole using my thumb(s), since it looks like it's sitting slightly to the left in the pic you took.
(Perhaps it's just stuck under/against that left edge). This would be the forward (muzzle) edge relative to the receiver itself.

Failing that, I'd spray penetrating oil around the sides of the button, hold the receiver assembly upside-down, and tap the back of it with a non-marring hammer (or tap the receiver against a large stationary piece of wood) in an attempt to dislodge the button.

You can also go in there with a tool and push it up, but depending on how/why it's stuck, that may scratch or bend something.

Sorry, the button got freed and was just held in by friction.  Button will not go back in enough to insert a new barrel.  Ended up using a duck tapped screw driver and rubber mallet and gently tapped it out with many quick taps.  Once it was dislodged from where it was in the picture it progressively got easier.  Called FN and explained everything to the person over the phone whom had me send it in.  The person that unboxed it called me asking why I sent something in that they cannot even look at and sent it back.  I am unsure what exactly is the problem, the receiver the button, both?

@speeddemon02 any update? I hope to soon embark on the same journey and would like to learn from your experience!

I'm very curious how your receiver came to be in this state - with no barrel and no spring, won't the button just naturally misposition itself?  Did you never use it with the original barrel? For less than shipping to FN, you could buy another button and see how it compares:
https://www.midwestgunworks.com/page/mgwi/prod/F811270017

I ended up sending it to Elite Ammo.  It was all original when I got it and I tried to do the barrel swap myself.  I was told the button was the issue as it was no longer square and just needed a button and spring replacement.  Just finished it up this past weekend and it is everything I hoped.

How strange! Glad you got it all taken care of - and I'll be extra careful with my button!!!! Thanks for the follow-up.