Steer clear of the Tupperware excel chassis. It's shit. The factory stock is far stiffer and not a whole lot heavier. My mate had one on his Grendel. Wandering zero with the amount of flex in it. Recently picked up an Elude for mine. It's night and day. Stiff, light and beautifully made. 6.5 Grendel 12.5 carbon tension sleeve. Happy with it. Haven't shot an ARC sorry
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