As depicted in the above post, the recoil springs on a para are mounted in the top cover ( para specific) rather than in a tube in the butt stock.
If you ever see a para with the buttstock folded, you will notice that the stock is actually mounted at an angle to the upper receiver. When folded, the top tube of the buttstock is below the ejection port just so that it can be fired whith the stock folded.
The down side to having the stock at an angle is that the hinge pin it perpenticular ( straight up) in relation the the line of the bore. This creates a pivot point ( where the stock meets your shoulder) that causes an uncomfortable cheek slap when fired.
I built my own para stocks and rather than having the stock at an angle, I made the hinge pin with an angle. This puts the stock in line with the bore, but allows that stock to be at an angle when folded. The result is no cheek slap, a perfect cheek weld for proper sight alignment while firing, and the stock is clear of the ejection port when folded.
ETA It looks like DSA is doing the same thing. Look closely at the hinge on the para pictured in this thread.
www.ar15.com/forums/topic.html?b=6&f=7&t=188371