Piston or DI for a Grendel Build?

[Klem]

Everything I have read or seen has DI AR15s as being more accurate than piston AR15s. Not to mention cheaper and lighter.

Have not seen any more or less accuracy with either system but I agree with your point that pistons are heavier, more expensive and not needed. Like the Blackout and moly coated bullets - After the initial hype dies down the passage of time renders their true worth.