Re: What\'s the difference?
Some of the PSS models were/are short actions.
Some PSS had 24" barrels (short action types I believe).
I've not come across a PSS with a J-Lock.
All Senderos are long action.
I don't recall seeing anything but 26" barrels on Senderos.
Some Senderos have J-Locks.
The PSS uses a chunkier stock, palm swells and such, generally nearly black in color.
The Senderos use a slim(er) hunting type stock, many are grey with black spiderweb.
There, now someone will correct me but it's okay cuz I forget things sometimes (and I quickly forget they correct me too).