best free float gas piston upper AR15 reciever

[fuj357racing]

i've heard of :

LwrC, LMT, POF, Novenske. please put them in order from best to not best.

[high_revs]

i'd say do a search... lots of comments on lmt and pof. noveske doesn't do a piston that i know of. it's a ymmv. including in there addax, which uses pwc i think.

[Addax]

Check out our Gas Piston Uppers.

We use Daniel Defense FF rails

http://www.calguns.net/calgunforum/newreply.php?do=newreply&noquote=1&p=2404982