POF USA or ADDAX gas piston?

[xfive]

Between the two, w/c is more reliable and dependable gas piston system?

[OldNavyGuy]

you need to expand your research on piston operated AR's, i hope this works, click on this link http://www.google.com/webhp?hl=en#hl=en&q=piston+operated+ar-15&btnG=Google+Search&aq=0&oq=piston+operated+&aqi=g8&fp=leBsIIJAIN0

[E53001]

http://m4carbine.net/showthread.php?t=13115 PWS piston review by Robb (Gotm)

http://m4carbine.net/showthread.php?t=26421 LMT MRP & HK 416
Comparison/review by SmgLee

These should get you started, there are other piston made conversions out there but im not quite sure anybody has done more reviews on them from this forum