Im a newb to the piston uppers, but I have the SA on a 12.5" middy that was badly overgassed when suppressed even with other adjustable gas blocks.  I chopped the barrel back to 11.9" and it is still overgassed suppressed even with the screw in full bleed off.  I forgot to try restriction, but before cutting the barrel back it ran at ONE click out suppressed.  Unsuppressed it runs fine at 7 turns out since I chopped it and ran at 8 turns out when it was still a 12.5".

Now BIG disclaimer.  This is on a game gun.  I have nothing milspec on it.  I theorize the SA piston is made for mil spec style guns for reliable function when dirty with weak ammo etc.  My set up is more like a Formula One race car with mud grips.  I typically need only about half the gas of milspec to run such a gun so the SA with suppressor is just too much "function".  I wish they would release a "performance" model with a smaller diameter piston and smaller outer dimensions plus a lightweight bolt carrier, but I honestly see very little market for such.  Just oddballs like me shooting 3 gun.

I am trying to trade for a BA Hanson to put the SA piston kit on.  Does BA put the gas port in a different location or what.  I already know they only use a 1.03" gas block shelf.  It looks like the SA kit will fit on that.  I also guess the BA hansons do not leave room for a handguard plate.  Does that mean the shelf for the gas block is too far forward with the Hansons or what?