I'm an archery hunter and this thought has crossed my mind too, I just have a hard time seeing how carbon arrows, which are quite flexible, would provide much stiffness.Head to the local archery shop and ask for a bunch of arrow shaft off-cuts of varying diameters (so you can sleeve them when you need a longer tube). I did that a couple years ago and walked out with a small grocery bag full of free carbon tubes to play with. Worked great on a factory Sako stock.
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