Right, they discontinue that model years ago. But do not hesitate for a minute on buying a used one. They do last 20 years without so much as an oring going bad (sorry fx -just to use a name there not the only ones- folks) and parts Are still easily available.
The one "struckat" pointe out to me does look to be a carbine just the longer airtube installed. Barrel should extend past aircap, that one is most likely put together by Peter from parts towards the end of that business but as the AA importer (his father) it would have had the factory warranty and she correct carbine airtube is cheap:
https://www.pyramydair.com/product/...0-s410-s500-and-510-carbine-air-rifles?a=7845 and ithat is an excellent value tho I personally prfer the older pre-safety 2 linlk sear trigger, just me tho as it is a fine trigger. The old 16mm shroud is quiter than the new model or a marauder or .. at same power. If you want one it might be worth checking into that one a bit.
I've had mine about 20 years (full long rifle) and love it. So smooth, fit & finish, can be stored 6 years and pulled out and 1st shot hit's the bullseye. Not so many of the latest greatest could make that claim.
John