I missed the concealment table info but that wasn't my primary concern. The item isn't illegal and despite being described as bulky there is nothing in the written rules to reflect that. Sure I could house rule it but that leads to unrest among the players.
GYRO MOUNT page 432 (bold by me)
"
This heavy upper-body harness features
an attached, articulated, motorized gyro-stabilized arm
that mounts an assault rifle or a heavy weapon. The system
neutralizes up to 6 points of recoil and movement modifiers.
Attaching or removing a weapon from the mount
takes a Simple Action.
Putting on a gyro-mount harness
takes about five minutes, while the quick-release allows
you to get out of it with a Complex Action.
Wireless: Activating the harness’s quick-release with a
wireless signal to exit the harness is a Free Action."
Does any thing there hint that you can hide this item while using it?
Better yet, does ANYTHING in that write up even hint that it can be concealed?
Sometimes, what the writer considers obvious is never stated.
(And yes, I am an ass)