I do not have a GS stock,,, but I have a custom carbon fiber that is close to this.
"""If""" the optic lens is too high,,, add a butt stock ammo pouch with a gel in-sirt to do a soft face plant.
Suck those straps up tight so things don't move.
The benefits of this allows the rifle to fit a solid bunny ear bag for sight in with out damaging the bag,,, and having access to 5 fast rounds and an extra 5 or 7 on-top of that. Pretty sure that a extra 1/2 pound ain't going to slow me down that much.
Actually going slower is another +. Ha