From Gunbroker via the FN Forums:
This listing is for FNH FS200 carbine. The gun comes in original box with accessories and manual. Original owner of the gun attempted to modify the frame to accept high capacity magazines such as Surefire OBJZ8 60 round mag (one included). Supposedly, the modification worked, but made the gun less reliable with standard FS mags. Upon inspection, the standard mag appears to be a bit loose. We have not shot the gun so could not confirm the claim. Outside of the modification, the gun appears in like new condition. The gun has a short 16” barrel including muzzle brake. The barrel is by Tornado Technologies LLC https://www.tornado-technologies.com/services.html. This is a great piece, especially if you are handy enough to make modification if needed.[/QUOTE]

The modification appears to be done by a real professional!

That is just insanity right there to do that to a weapon. How someone could take that in and put it on Gunbroker is beyond me. For Gunbroker to accept it, is pure failure. Hopefully no one even bothers to bid on it. This one is definitely a top ten Hall of Shame winner!