What's the actual chat about now on this thread?
There both quite literally the same rifle. Air arms, being a company that wants to make money, has created a different looking rifle that is exactly the same internally, and thought, "these look a bit full bore like... Shall we charge more for them?"
What makes the rifle shoot differently, and they do indeed shoot differently, is the structural differences.
Nothing more.
PS's are 'generally' lower on power mind. Imagine, TX Mk2 (that's one before yours Mark) comes of the line... superb, Air Arms... "We could make a new rifle fr