OK Ray, let me try to explain. I can see where it can be confusing..

Crosman NPSS and Remington NPSS come in either .177 or .22.... The new Benji Trail NP comes only in a .22 The new Benji Trail XL comes both the .177and.22.
Ok now the Crosman NPSS is now made under the name of Remongtion NPSS.
The Benji Trail NP is basically the same size air gun as the NPSS series. Just has a fancy wood stock.
The Benji Trail XL is what we call a MAGNUM air gun with a fancy stock. Very heavy gun..
I will not go into the interal structure differences because I have already done reviews on that.