Belgium The New Century Rifle; Different and Unusual.

I and 2 friends were at 2 gun shows yesterday at Shipshewana, Indiana. One of them was in the Homestead Building and the other in the Auction Barn. I had seen this rifle on/off over the past year but never really caught my attention till I started looking at Singe Shot 22 Rifles. When I saw the inside of the barrel and to me it looked like a smoothbore. I had asked 6 dealers 5 said smoothbore 1 said faint rifling. The photo sort of suggests faint rifling but it also could be considered smooth. The pistol grip/ wire frame, I told the 6 that the guy I bought it from had the wire part made. I also asked the 6 if they thought the stock or pistolgrip is original? 6 said it seemed to be original for the rifle. You can see in the photos there are 2 specific pieces of wood. I found there are no other examples of this type of a a pistol/rifle? The marks on the receiver and bolt are identical to others I have seen. I can't really date this but it has a Serial number under the barrel by the stock of 88837. Unique to say the least. I tried shooting 22 lr in it and well it stuck. It is missing the extractor that should slide under the bolt similar to my JGA Anschutz. I dropped the extractor from it into the slide area and it was the exact width. I just don't know how it would fit against the chamber face or under the bolt. The JGA one has a larger 2 piece head that fits in the chamber face and is longer. I shot 22 cb shorts in it today 10 of them at 10 yards ish. I even put 2 in the same hole. I can't wait to see what 22 bird shot does in it. I plan on taking to my gun smith to ask for help. He likes unicorns.