I'd go 14.5 with a perm mount too if I wanted a ~16 gun. 16" with a can added gets long!
I love my 11.5" POF upper. I've shot both di and piston and I prefer my piston for suppressed due to the cleaning issue. I just have to remove the plug on the gas block and wipe it down along with the piston. Just have to wipe out the receiver/bolt carrier group and it is good to go.
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