Truly excellent rifle.
But given a choice, I'd prefer an M-4.
I just can't see the need for the additional weight and complexity of a piston.
But if you're comfortable with it, I say go for it.
I didn't fight to defend your freedom so you could vote to take away mine.
"A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself.
John Stuart Mill."