I saw the LWRC PSD upper and it looks pretty cool. Basically it is an 8" piston upper in 6.8 or 5.56.
Now, I was curious if any of the current piston systems could be cut down to make a clone? Just the PSD uppers are going for $2500+
There is definitely something perverse about two men who carry guns 24/7 being so happy that others are giving theirs up. -happycynic