AR folding stock

Looks pretty cool, just remember it can't be used on an Ar-15 unless it is a .22 since it eliminates the receiver extension tube.
 
Some piston uppers allow for folding stocks but I can't remember for the life of me who makes them...

I think you might be referring to the Para AR-15. It's not a piston drive but uses a modified upper to eliminate the buffer. The fact that it's a piston drive does not mean that it has eliminated the buffer. Could be wrong but that's my understanding.

Al Zitta's system is the upper mods. check this out; ###.zmweapons.com
 
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