where's the piston/oprod uppers?

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Originally Posted by Titleiiredneck

May do one in the future if i can find a kit for a pistol port cheap if not then not a problem since i don't
plan to drop 350 or so on a idea that may not work.

I initially looked into doing my upper with this way. The only pistol kit I found was from Adams arms and it was like 500.00 bucks! That pretty much decided it for me. I would love to see if how it would work...so you should still totally do it