I'm a civ so take this FWIW, but I'd go with shorty. I just measured out the lengths and 10.5" is rather long. I like mine a little longer than the 7.75" which you might attain when the stock contacts you vest (if this is a patrol rifle). You might also be able to add a larger butt pad to gain length. With the longer one you're stuck.
What will it be used for?
What will it be used for?
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