A round tube of the same volume uses less material = lighter, and is stronger (more rigid), so again less material needed = lighter.
The Argus Ain't light , how much of this is down to the shroud?.
BUT, if it means not having to put a Mod on the rifle, then weight (plus length) saving. so, win win?.
Caveat, I am no expert on anything, feel free to correct me.
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If you are going to carry a gun around, and are not really very interested in extreme accuracy, then yes, weight is a concern. But then why even HAVE a shroud at all, if its really just extra weight?
But, if you want the gun as quiet as possible for a given length, then using a shroud-type silencer with hige square tubing prolly would give great results,
I too have recently considered building a square shroud/silencer onto a new gun I’m making because i don’t ind exrtra weight but don’t want extra length way past the muzzle. My gun’s target weight is around 15 pounds.
LD