Agree 100% w/eightbore's remarks on those FN's; they are steadfastly reliable. I've two and have had them for a few decades, never an issue. One of them has Mod/Mod factory chokes! It belonged to and was ordered by a pheasant hunter originally. One might imagine he wasn't about to be confused;-)
I also have a Remington Spartan 28ga. O/U made by Baikal w/their single trigger version of a switch bbl./choke single trigger. One simply pushes the trigger forward BEFORE firing to select the upper bbl. firing first. It is NOT a finely finished gun, but it does have some fun features like the trigger and being able to disable the ejectors easily. I've probably fired north of ten flats of ammunition thru mine & never had the first issue. Finish is frankly crude, but function is fine. No question they were being made to a 'price point', but it was good value, while it lasted. Very decent bird guns for rough use.
I had a Holland & Holland with that trigger, or, their version of it. Finish on the gun was quite good, but, the trigger was crude.
Best,
Ted