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If you're staying with TTB just use a set of 78/79 arms, they're longer than the stock TTB arms. I think they're interchangable too. I'd to make sure that's fact before going and buying a set though.
Okay, ignore this. I found the guys build thread I was thinking of and he modifyed the TTB arms because he already had extended TTB arms when he did the SAS and they were longer than the stock 78/79 arms.