There had been several versions, mine is a "Panzer II".
The buttstock has a plastic/rubber buffer at the end (where it contacts the shoulder), which has a Barnett logo impressed.
While I made some photos of my Panzer II, there is nothing special or different.
Just check for images of "Barnett Panzer II" online.
As said, the buttstock rubber buffer carries a Barnett logo.
As does the limb, on both sides, on the frontside.
Yours is similar, but clearly somewhat different.
Perhaps a Panzer I, a prototype, or a copy.
Since your location seems to be Europe/RO (unless you use a VPN), a Barnett product is more plausible than a US crossbow.
The limb should be one piece, clamped into the stock with one screw from the front.Not knowing what exactly brand / model it is the question is if I can find parts for it…string arrow etc